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OPERATION MANUAL MV-1600 Multi Viewer S 2nd Edition Precautions Important Safety Warnings [Power] Operate the unit at the specified supply voltage only. Caution Unplug the power cord by pulling the plug only. Do not pull on the cable. Stop Do not place or drop heavy or sharp-edged objects on the power cord. A damaged cord can cause a fire or electrical shock. Regularly check the power cord for excessive wear or damage to prevent possible fire or electrical hazards. [Grounding] Ensure the unit is properly grounded at all times to prevent electrical shock. Caution Hazard Do not ground the unit to gas lines, units, or fixtures of an explosive or dangerous nature. Ensure the power cord is firmly plugged into an AC outlet. Caution [Operation] Hazard Do not operate the unit in hazardous or potentially explosive environments. Doing so could result in a fire, explosion, or other accident. Do not allow liquids, metal pieces, or other foreign objects to get inside the unit. Doing so could result in a fire or other hazard, or malfunction. Hazard If a foreign object gets inside the unit, turn the power off and disconnect the power cord immediately. Remove the foreign object, and then contact your authorized service representative if damage has occurred. [Transportation] Caution Handle with care to avoid shocks in transit. Shocks may cause a malfunction. When you need to transport the unit, use the original packing materials or equivalent packing. [Circuitry Access] Do not remove any covers, panels, casing, or access circuitry while the power to the unit is on! Turn the power off and disconnect the power cord prior to removing any parts. Internal servicing and adjustment of the unit should be performed by qualified personnel only. Stop Do not touch any parts or circuitry with a high heat factor. Capacitors can retain enough electric charge to cause a mild to serious shock even after the power is disconnected. Capacitors associated with the power supply are especially hazardous. Avoid contact with any capacitors. Hazard The unit should not be operated or stored with the cover, panels, or casing removed. Operating the unit with the circuitry exposed could result in electric shock, fire, or a malfunction. [Potential Hazards] Caution If the unit emits any abnormal smells or noises, immediately turn the power off and disconnect the power cord to avoid a potentially hazardous situation. If this problem occurs, contact your authorized service representative before attempting to operate the unit again. [Consumables] Caution The consumables used in unit must be replaced periodically. For further details on which parts are consumables and when they should be replaced, refer to the specifications at the end of the Operation Manual. Since the service life of the consumables varies greatly depending on the environment in which they are used, they should be replaced at an early date. For details on replacing the consumables, contact your dealer. [Rubber Feet] Caution If this product includes rubber feet attached by screws, when the rubber feet and screws are removed, do not reinsert the screws without the rubber feet. Doing so could cause damage to the internal circuits or components of the unit. Also, when reinstalling the rubber feet to the unit, use only the supplied rubber feet and screws. Upon Receipt Unpacking The MV-1600 units and their accessories are fully inspected and adjusted prior to shipment. Operation can be performed immediately upon completing all required connections and operational settings. Check your received items against the packing lists below. ITEM QTY MV-1600 1 AC Cable 1 Rack mount bracket 2 Rubber feet 4 Remote Control Software 1 Operation Manual 1 set REMARKS CD-ROM One for main unit. One for software. Check Check to ensure no damage has occurred during shipment. If damage has occurred, or items are missing, inform your supplier immediately. 目次 1. Prior to Starting........................................................................................................................... 1 1-1. Welcome ............................................................................................................................ 1 1-2. Features ............................................................................................................................. 1 1-3. About This Manual.............................................................................................................. 2 2. Panel Descriptions ..................................................................................................................... 3 2-1. Front Panel......................................................................................................................... 3 2-2. Rear Panel ......................................................................................................................... 5 3. Connection ................................................................................................................................. 6 3-1. System with SXGA Output ................................................................................................. 6 3-2. System with Video Transmission........................................................................................ 6 3-3. System with SXGA and Video Transmission ...................................................................... 7 3-4. Network Options................................................................................................................. 8 3-4-1. UNICAST Mode.......................................................................................................... 8 3-4-2. MULTICAST Mode ..................................................................................................... 8 4. Operation ................................................................................................................................... 9 4-1. Operation at Startup ........................................................................................................... 9 4-2. Initialization ........................................................................................................................ 9 4-3. Modifying SXGA Output Timing ........................................................................................ 10 4-4. Displaying Full Screen...................................................................................................... 11 4-5. Displaying Split Screens................................................................................................... 12 4-6. Selecting Split Screen Pages ........................................................................................... 13 4-7. Auto Sequencing Mode .................................................................................................... 14 4-7-1. Full Screen Auto Sequencing ................................................................................... 14 4-7-2. Quad and 9-split Screen Auto Sequencing............................................................... 14 4-8. External Alarm and Video Loss Display............................................................................ 15 4-8-1. Full Screen Setting ................................................................................................... 15 4-8-2. Split Screen Setting .................................................................................................. 17 4-8-3. Clearing Alarm or Video Loss Alarm Status .............................................................. 18 5. Menu Operations...................................................................................................................... 19 5-1. Main Menu Display........................................................................................................... 19 5-2. TIME SETUP (Time Settings)........................................................................................... 21 5-2-1. Auto Sequencing Interval Settings............................................................................ 22 5-3. ALARM/VIDEO LOSS (Alarm and Video Loss Settings) .................................................. 23 5-4. TITLE (Camera Title Settings) .......................................................................................... 25 5-4-1. TITLE SET (SXGA・VIDEO) ..................................................................................... 26 5-5. DISPLAY (Screen Display Settings) ................................................................................. 28 5-6. LAN (LAN Settings) .......................................................................................................... 30 5-7. SYSTEM (System Settings)..............................................................................................32 6. REMOTE / ALARM Interface ....................................................................................................34 6-1. Connector Pin Assignments ..............................................................................................34 6-2. REMOTE Interface............................................................................................................35 6-3. ALARM Interface...............................................................................................................37 6-4. FAN ALARM Output ..........................................................................................................37 6-5. RS-232C Interface ............................................................................................................38 6-5-1. RS-232C Connector..................................................................................................38 6-5-2. Cable Connection Example ......................................................................................38 6-5-3. Communication Standard..........................................................................................38 7. LAN Interface ............................................................................................................................39 7-1. LAN Connector .................................................................................................................39 7-2. Ethernet Communication Standard ...................................................................................39 8. Troubleshooting ........................................................................................................................40 9. Specifications and Dimensions .................................................................................................41 9-1. Specifications ....................................................................................................................41 9-2. External Dimensions .........................................................................................................43 1. Prior to Starting 1-1. Welcome Congratulations! By purchasing MV-1600 Multi Viewer, you have entered the world of FOR-A and its many innovative products. Thank you for your patronage, and we hope you will turn to FOR-A products again and again to satisfy your video and audio needs. FOR-A provides a wide range of products, from basic support units to complex system controllers, which have been increasingly joined by products for computer video based systems. Whatever your needs, talk to your FOR-A representative. We will do our best to be of continuing service to you. 1-2. Features The MV-1600 is the 16-split multi viewer that accepts asynchronous color or B/W video signals from up to 16 cameras, reformatting the images for display on a single screen. Monitor output includes two analog composite video outputs and one analog RGB SXGA output. SXGA output enables Quad screen monitoring at a higher resolution than conventional multi viewers with virtually no size reduction of the video from each camera. The video transmission over a network is also possible for easily expanding the existing analog video monitoring system to a remote monitoring system. Moreover, it has a multicast function which enables simultaneous display on multiple PC monitors. In addition to in-store monitoring, the MV-1600 supports a wide range of other monitoring applications in banks, hotels, amusement parks, theaters, and production lines. Capable of using in mixed system of asynchronous, color or B/W signals Easy system expansion using input loopthrough Monitor output includes SXGA high-resolution output in addition to analog composite output Two analog composite output lines. Screen display can be selected from full screen, quad screen and 16-split screen SXGA display can be selected from full screen, quad screen, 9-split screen and 16-split screen Video transmission function with maximum frame rate of 60 fps (when using the MV-1600 Live Viewer software) * A frame rate of 60 fps may not be obtained due to the conditions of transferred video signal, JPEG compression ratio, connected PC, or network environment. Selectable two types of network modes: unicast and multicast Automatic channel switching function (in full screen and split screen) Built-in input/output connector for external alarm enables linking of display to alarm system Parallel remote connection. Control over a RS-232C interface is supported Supports control over a LAN (100BASE-TX) interface Supports display of titles up to 8 characters on SXGA output and up to 6 characteers on analog composite outputs for each camera (alphanumeric characters, Japanese kana, symbols) 1 1-3. About This Manual This manual is intended to help the user easily operate this MV-1600 and make full use of its functions during operation. Before connecting or operating your MV-1600, read this operation manual thoroughly to ensure you understand the product. After reading, keep this manual in a safe place and available for reference. Font Conventions The following conventions are used throughout this manual: Text enclosed by a square (such as ENTER) indicates buttons on operation panel. Text enclosed by square brackets (such as [Exit]) indicates menu items. 2 2. Panel Descriptions 2-1. Front Panel (3) AUTO 1 ALARM RESET A 2 3 4 B C D 5 6 7 VIDEO SELECT 8 9 (5) 10 11 12 13 14 15 16 MV-1600 MULTIVIEWER POWER ON OFF ENTER SPLIT MENU FANALARM POWER (1) (8) (2) (6) (4) (7) (9) (1) POWER switch Used to turn the unit power ON/OFF. IMPORTANT When powered on, the MV-1600 attempts to pick the video standard (NTSC or PAL) automatically based on the input signal it receives. If there is no video input, it selects the video standard that is selected at the previous startup. Using NTSC and PAL at the same time is not supported. Be sure not to use different formats together. It may cause malfunctions. (2) AUTO/ALARM RESET AUTO: When this button is pressed and lamp is lit, automatic channel switching is performed in full screen display, or automatic page switching is performed in quad and 9-split screen display. ALARM RESET: The button flashes when an external alarm signal is received or video loss occurs (when the image is cut). Press this button to clear the alarm. IMPORTANT External alarms cannot be cleared when LEVEL is chosen for ALARM INPUT. (See section 5-3. "ALARM/VIDEO LOSS".) (3) SELECT 1 - 16 (Camera select buttons) Used to select a camera input for full screen display. (4) A, B, C, D Used to select a assigned page for split screen display. (See section 4-6. "Selecting Split Screen Pages") (5) ENTER Used to navigate the Menu screen. 3 (6) SPLIT (Split Display Button) Used to select the split display mode. (7) MENU (Menu button) Used to start menu mode. In menu mode, this button is also used to return to the previous menu screen or to exit menu mode. * To display the menu, press and hold the MENU button for about 2 seconds. (8) Power indicator: The Power indicator will be lit green when power switch is set to ON and power is supplied to the unit. FAN ALARM indicator: The Fan Alarm indicator will be lit red when the fan is stopped. (9) Fan (Front) Used to air cool the unit to prevent overheating. The air flows from the front to the side. Do not block the fan vent with an object. 4 2-2. Rear Panel 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 IN LAN 75 A UTO T HRU 2 OUT (10/100BA SE -T) (3) (5) VIDEO OUT VIDEO IN (1) S / NO. REMOTE /ALARM VGA OUT AC–100–240V 50 / 60Hz IN (2) (4) (2) (6) (7) (1) VIDEO IN 1 - 16 The top connectors are used to input video signals. To loop through the signals to other devices, connect to the bottom connectors. The bottom connectors are automatically terminated when not connected. (2) VIDEO OUT 1/2 Each connector is used to output an analog composite signal to a monitor. The full or split screen display can be selected by the button on the front panel or by the control from external device. (3) VGA OUT Used for analog RGB monitor output connection. Connect SXGA (1280 x 1024 pixel 60 Hz) monitor. IMPORTANT To use SXGA output, select SXGA or SXGA & NETWORK in the FUNCTION menu. See section 5-7. "SYSTEM (System Settings)" for details. (4) REMOTE/ALARM Used for either the external control connection (remote unit or RS-232C interface) or the alarm input connection. (5) LAN(10/100BASE-T) LAN interface (Ethernet) used for remote control by computer. This can be also used for video output to the computer over a LAN interface. IMPORTANT To output video to a computer, select NETWORK or SXGA & NETWORK in the FUNCTION menu. See section 5-7. "SYSTEM (System Settings)" for details. (6) Ground Terminal Used to ground the unit to protect operators against static electricity and electrical shock. (7) AC IN (100-240V AC 50/60Hz) Used for connecting to an AC power source using the supplied accessory cord. 5 3. Connection 3-1. System with SXGA Output PC Monitor High-resolution monitoring in full, quad, 9-split or 16-split screen by SXGA output. Analog video camera 1 - 16 NTSC/PAL To next unit (Router, etc.) SXGA Disc recorder, etc. NTSC/PAL AUTO 1 ALARM RESET A 2 3 4 C D 5 6 VIDEO SELECT 8 9 7 10 11 12 13 14 15 16 Record full, quad or 16-split image MV-1600 MULTIVIEWER POWER ON OFF B SPLIT ENTER MENU FANALARM POWER MV-1600 LAN Control PC Remote control over LAN interface IMPORTANT To connect a PC and MV-400 directly, use a crossover LAN cable. If you are connecting PC and MV-400 through a hub or such device, use a straight LAN cable. 3-2. System with Video Transmission Analog composite monitor Monitoring in full, quad, or 16-split screen Analog video camera 1 - 16 NTSC/PAL NTSC /PAL Disc recorder, etc. Record full, quad 16-split image Client PC AUTO 1 ALARM RESET A 2 3 4 B C D 5 6 7 VIDEO SELECT 8 9 10 11 12 13 14 15 16 POWER ON OFF SPLIT ENTER MENU FANALARM POWER MV-1600 LAN MV-1600 MULTIVIEWER Remote monitoring in full, quad or16-split display LAN Ethernet ROUTER ROUTER 6 or 3-3. System with SXGA and Video Transmission Analog composite Record full, quad or 16-split image Analog video camera 1 - 16 Disc recorder, etc. NTSC/PAL NTSC /PAL AUTO 1 ALARM RESET A 2 3 4 B C D 5 6 7 VIDEO SELECT 8 9 10 11 12 13 14 15 16 MV-1600 SXGA MULTIVIEWER POWER ON OFF ENTER SPLIT MENU FANALARM POWER MV-1600 LAN PC モニタ High-resolution monitoring in full, quad, 9-split or 16-split screen by SXGA output. ROUTER Client PC Ethernet LAN ROUTER Remote monitoring in full, quad or16-split display IMPORTANT When both the SXGA output and the video transmission to a computer are used at the same time, refresh rate of the SXGA display drops to about a half the rate of using the SXGA alone. Refresh rate of the video transmission also drops compared to the rate of using the video transmission alone. The display screen settings are shared by SXGA output, VIDEO output and the video transmission over a LAN interface. See section 4-5. "Displaying Split Screens" for the detail on display screen settings. 7 3-4. Network Options There are two network modes for video transmission. The UNICAST mode and the MULTICAST mode. See section 5-7. “SYSTEM (System Settings)" for the setting procedures. 3-4-1. UNICAST Mode The UNICAST mode uses TCP/IP protocol and the video output can be displayed on one PC by using MV-1600 Live Viewer. Analog Video cameras 1 - 16 AUTO 1 ALARM RESET A 2 3 4 B C D 5 6 VIDEO SELECT 8 9 7 10 11 12 13 14 15 MV-1600 16 MULTIVIEWER LAN POWER ON OFF ENTER SPLIT MENU FANALARM POWER Switching HUB LAN MV-1600 PC 3-4-2. MULTICAST Mode The MULTICAST mode uses the IP multicast and that enables you to output video to multiple PCs. Analog Video cameras 1 - 16 AUTO 1 ALARM RESET A 2 3 4 B C D 5 6 7 VIDEO SELECT 8 9 10 11 12 13 14 15 16 MV-1600 MULTIVIEWER POWER ON OFF SPLIT ENTER MENU FANALARM POWER LAN Switching HUB MV-1600 PC IMPORTANT The MV-1600 Live Viewer cannot control video output in the MULTICAST mode. To control the output video, use the VIEWER screen of Internet Explorer. This network uses the UDP protocol. Due to the UDP protocol, the image refreshment may get disturbed at the packet loss which occurs under the unstable network condition. 8 4. Operation 4-1. Operation at Startup After the power is turned on, operation resumes from the last screen before it was turned off. If a menu is displayed when the unit was turned off, operation resumes from the previous mode. 4-2. Initialization Although initialization is not normally required, you can restore the MV-1600 to the factory settings when the previous data is no longer needed such as after relocation or system modification. Turn the power on while holding down the AUTO button to initialize the data settings. AUTO button AUTO 1 2 3 4 ALARM RESET A B C D 5 6 7 VIDEO SELECT 8 9 10 11 12 13 14 15 16 POWER ON OFF ENTER SPLIT MENU FANALARM POWER POWER switch 9 MV-1600 MULTIVIEWER 4-3. Modifying SXGA Output Timing It is not required in the usual operation, however, it is possible to adjust output timing for the connected SXGA monitor. Turn the power on while pressing MENU button to open SXGA SETUP screen. AUTO 1 2 3 4 ALARM RESET A B C D 5 6 VIDEO SELECT 8 9 7 10 11 12 13 14 15 MV-1600 16 MULTIVIEWER POWER ON OFF ENTER SPLIT MENU FANALARM POWER POWER switch MENU button The SXGA SETUP screen shown below is displayed. SXGA SETUP SXGA DMT (1) H SYNC POSITIVE (2) V SYNC POSITIVE (3) <SXGA SETUP 画面> ※上図の各設定は工場出荷時の設定です。 AUTO 1 2 3 4 ALARM RESET A B C D 5 6 7 VIDEO SELECT 8 9 10 11 12 13 14 15 16 POWER ON OFF ENTER SPLIT MENU FANALARM POWER MENU button Operation Procedure Button MENU Action Moves the cursor down. Moves the cursor up. Changes the setting item value. (Reverse) Changes the setting item value. (Forward) Exits the SXGA SETUP screen. 10 MV-1600 MULTIVIEWER Setting Item Item Description Changes SXGA output timing standards. Horizontal frequency: 64.0kHz DMT Vertical frequency: 60.0Hz Horizontal frequency: 63.7kHz CVT Vertical frequency: 59.9Hz Horizontal frequency: 63.6kHz GTF Vertical frequency: 60.0Hz POSITIVE H-sync polarity: Positive NEGATIVE H-sync polarity: Negative POSITIVE V-sync polarity: Positive NEGATIVE V-sync polarity: Negative (1) SXGA (2) H SYNC (3) V SYNC IMPORTANT The SXGA SETUP setting is applied when the MV-1600 is turned on. Whenever the settings are modified, make sure to close the SXGA SETUP screen by pressing MENU button, turn the MV-1600 power off and reapply the power to the unit. 4-4. Displaying Full Screen To display your desired channel in a full screen, use SELECT 1 to 16 buttons. For instance, to view channel 3, press the SELECT 3 button to display the video in full screen. SELECT 1 to 16 AUTO 1 ALARM RESET A 2 3 4 B C D 5 6 7 VIDEO SELECT 8 9 10 11 12 13 14 15 16 MV-1600 MULTIVIEWER POWER ON OFF ENTER SPLIT MENU FANALARM POWER IMPORTANT A black screen is shown for channels with no input signals. It displays the same channels for SXGA output, VIDEO output and the video transmission over a LAN interface. There may be an image distortion (1frame:1/60sec.) at switching channels. 11 4-5. Displaying Split Screens To display split screen, select and press a SPLIT button to display. AUTO 1 2 3 4 ALARM RESET A B C D 5 6 7 VIDEO SELECT 8 9 10 11 12 13 14 15 16 MV-1600 MULTIVIEWER POWER ON OFF ENTER SPLIT MENU FANALARM POWER SPLIT button Quad 9-split 16-split IMPORTANT It displays the same channels for SXGA output, VIDEO output and the video transmission over a LAN interface, when the display is in the quad or 16-split screen mode. However, when 9-split screen mode is selected, it displays SXGA output in 9-split screen, but it displays VIDEO output and the video transmission over a LAN interface in 16-split screen. Correlation table of display screens The table below shows the actual display screen in SXGA output, VIDEO output and the video transmission over a LAN interface for each display screen setting. SXGA output VIDEO output Video transmission over a LAN interface Full screen Full screen Full screen Quad screen setting Quad screen Quad screen Quad screen 9-split screen setting 9-split screen 16-split screen 16-split screen 16-split screen setting 16-split screen 16-split screen 16-split screen Full screen setting Split screen displays Each split screen is displayed as below. A Quad screen 9-split screen * Only in SXGA output 12 16-split screen 4-6. Selecting Split Screen Pages In the MV-1600, the quad screen has four pages (A to D) and 9-split screen has two pages (A and B). The each page is allocated a set of different channels. The followings are the procedure to switch pages of each split screen. AUTO 1 ALARM RESET A 2 3 4 B C D 5 6 7 VIDEO SELECT 8 9 10 11 12 13 14 15 MV-1600 16 MULTIVIEWER POWER ON OFF ENTER SPLIT MENU FANALARM POWER A, B, C, D button (Page button) SPLIT button 1. Press a SPLIT button for the split screen to display to enter split mode. In the split mode, the selected SPLIT button and the displayed page light up and the available pages flash for about 5 seconds. 2. Select and press a page button to display. The split mode is released, and the selected page stops flashing and lights up. To switch the displayed page also need to press SPLIT button to enter split mode before pressing the page button to display. Channel assignment for each quad screen page (A to D) 1ch 2ch 5ch 6ch 9ch 10ch 13ch 14ch 3ch 4ch 7ch 8ch 11ch 12ch 15ch 16ch A B C D Channel assignment for each 9-split screen page(A and B) *Only in SXGA output 1ch 2ch 3ch 10ch 11ch 12ch 4ch 5ch 6ch 13ch 14ch 15ch 7ch 8ch 9ch 16ch 1ch A 2ch B IMPORTANT The page switching is not available for 16-split screen display. In quad and 16-split screen, the same channels are displayed in SXGA output, VIDEO output and the video transmission over a LAN interface. However, when 9-split screen is selected, 9-split screen is displayed in SXGA output, but 16-split screen is displayed in VIDEO output and the video transmission over a LAN interface. The channel assignments for pages cannot be changed. There may be a distortion (1frame:1/60sec.) when switching channels. 13 4-7. Auto Sequencing Mode The displayed channel in full screen display or page in split screen display can be changed automatically. NOTE The display interval can be set in the menu. See section 5-2-1. "Auto Sequencing Interval Settings" for details. 4-7-1. Full Screen Auto Sequencing 1. Press VIDEO SELECT 1 to 16 button to display a full screen. 2. Press AUTO button. The button lights up and it starts to switch channels automatically and sequentially. 3.Press VIDEO SELECT 1 to 16 button or any one of the SPLIT button to stop auto sequencing. IMPORTANT Channels without video signals and channels for which the auto sequencing intervals are set to '0' are automatically skipped. There may be a distortion (1frame:1/60sec.) when switching channels. 4-7-2. Quad and 9-split Screen Auto Sequencing 1. Press the desired SPLIT button to display the split screen for auto sequencing. 2. Press the AUTO button. The button lights up and it starts to switch split pages automatically and sequentially. IMPORTANT Channels that meet any of the following conditions are automatically skipped. Channels with no video signal Channels for which the auto sequencing intervals are set to '0'. (See each channel settings in section 5-2-1. "Auto Sequencing Interval Settings".) The auto sequencing interval can be set at SPLIT in AUTO SEQUENCING menu as described in section 5-2-1. "Auto Sequencing Interval Settings". There may be a distortion (1frame:1/60sec.) when switching split pages. In the example of the split screen auto sequencing below, the page D is not displayed: e.g. Split configuration: quad CH13, CH14 : No signal CH15, CH16 Auto sequencing interval is set to '0' for each channel (IMPORTANT If auto sequencing is set for 9-split screen display, the display on VIDEO output and the video transmission over a LAN interface are in 16-split screen mode. 14 4-8. External Alarm and Video Loss Display When an external alarm is received or video loss is detected, the unit can be automatically switched to the following two alarm displays (alarm display modes). The alarm display mode can be selected in the menu screen. For details on setting, see section 5-3. "ALARM/VIDEO LOSS". 4-8-1. Full Screen Setting When an external alarm is received or video loss is detected, the corresponding channel is displayed in full screen. If more than one channel is affected, each channel is displayed sequentially for one second. Regular display operation is restored after all external alarms and video loss signals are cleared. Switch every one second Normal display Full screen display of CH1 Alarm detected in CH1 Full screen display of CH1 Full screen display of CH2 Full screen display of CH1 Full screen display of CH2 Normal display CH1, CH2 Alarm, video loss cleared Video loss detected in CH2 IMPORTANT If ALARM is set to OFF in the menu, no alarm screen is shown when an alarm is detected. For details, see section 5-3. "ALARM/VIDEO LOSS”. If LOSS is set to OFF in the menu, no alarm screen is shown when a video loss is detected. For details, see section 5-3. "ALARM/VIDEO LOSS”. If an alarm is input while displaying the menu screen, the alarm input is not detected. If there is still an alarm input when returning to regular operation after exiting the menu screen, the alarm input is detected. If the input video is cut off while displaying the menu screen, video loss is not detected. If the input video is not yet restored when returning to regular operation after exiting the menu screen, the video loss is detected. There may be a distortion (1frame:1/60sec.) when switching channels. 15 SXGA Output Screen A tally frame and "A" are displayed for the channel that receives an alarm input. a tally frame is displayed on the black screen for the channel that is affected by video loss.