Transcript
Traffic Control Synchronization System (SIMSYNC-M34) rev 5.0 SIMREX Corporation
Introduction The SIMREX Corporation SIMSYNC-M34 is a device used for time synchronization of traffic control devices. It consists of the SIMSYNC controller and a weatherproof/tamperproof GPS receiver. The SIMSYNC controller receives GPS messages from the GPS receiver, reformats the information to your local time zone, automatically adjusting for Daylight Savings Time (DST) and leap years and then sends time information in UTC (or GMT) time to the Eagle Controller at an interval based on your custom settings. There are five (5) connection points on the SIMSYNC unit: 1. POWER (2-pin Phoenix) – positive (inside) and negative (outside) for 9-24VDC input. Optional wall mount or desk mount power adapter are available. 2. RELAY (3-pin Phoenix) – normally open, normally closed and common connection points 3. GPS (6-pin PS2) – proprietary connection for SIMREX SIMGPS1-HD-PS2-5V GPS antenna. 4. CONTROLLER/PROGRAM/MONITOR (DB9F) – multi function – a) connection to Eagle Controller for normal operation using proprietary controller cable (supplied) b) programming of SIMSYNC controller using standard DB9M to DB9F serial cable (See SIMSYNCM34 Commands below) c) monitoring of GPS message strings using standard DB9M to DB9F serial cable. 5. FLASH UPDATE (DB9M) – firmware upgrade using proprietary flash upgrade cable (optional). A drilling template is provided for accurate installation of the GPS antenna enclosure to the top of the traffic control box or applicable enclosure. Apply RTV adhesive (provided) between antenna enclosure and traffic control box to prevent leakage. Mounting brackets for the SIMSYNC are also available. After the mechanical installation is complete, make the following connections: 1. 2. 3. 4.
Plug the GPS receiver PS2 connector into the SIMSYNC controller. Make applicable relay connections, if needed Install controller cable between SIMSYNC DB9F and Eagle controller (see connection list below) Install power connection. SIMSYNC-to-Eagle Controller Interface EAGLE PORT 2
SIMSYNC
(DB 25)
(DB-9)
7 (GND)
5
3
2
2
3
5 8
Tied Together
20
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Traffic Control Synchronization System (SIMSYNC-M34) rev 5.0 SIMREX Corporation LED Indicators PWR LED
Indicates voltage at the output of the internal 5V regulator. This power is used for the GPS as well as the SIMSYNC controller.
GPS LED
Indicates the presence of GPS data sent to the SIMSYNC controller. A flash occurs every time there is a message. This should be once per second. A short flash of 100 ms indicates data that does not have a valid time and or date and is thus not used by the SIMSYNC to synchronize it’s own Real Time Clock. A long flash of 500 ms (50% duty cycle on the LED as it is flashing once per sec) indicates that valid time and date are sent from GPS to SIMSYNC.
SYNC LED
Indicates that data is sent from SIMSYNC to Eagle Controller. If the unit has been just powered up, no message is sent to the Eagle Controller until valid data (time/date) is sent from the GPS to the SIMSYNC Controller so that the SIMSYNC real time clock may be initialized. Once the SIMSYNC real time clock has been initialized, the SIMSYNC will continue to send date and time to the Eagle even if it loses contact with the GPS or if the GPS produces invalid data (signal blockage). During periods of lost GPS signal or invalid data, the SIMSYNC will coast on its own internal clock and update the controller.
The relay on SIMSYNC units can be heard to click when a message is sent to the Eagle Controller. Update Rate For testing purposes, any update rate may be used so that correction of a controller may be quickly seen. Five (5) to thirty (30) seconds is common for this. In a permanent installation, it is recommended that an update of only once per day is used. A common practice is to use 4:00 AM. Startup The SIMSYNC controller will produce and send valid time/date messages to the Traffic Controller in less than 5 minutes if it is powered up in an area that has a good view of the sky AND if it has been powered up with valid GPS data in the last 1 to 2 weeks. If the SIMSYNC controller has been powered down for more than 1 to 2 weeks, it can take as long as 12.5 minutes to produce valid GPS time and date. The 12.5 minute delay is not a limitation of the SIMSYNC, but rather the GPS ALMANAC message structure that is broadcast by GPS satellites every 12.5 minutes. Configuration Any terminal program can be used to configure the SIMSYNC controller. Windows HyperTerminal, for example, is a common choice. The configuration port settings on the SIMSYNC default to 19,200 baud, 8 data bits, no parity, 1 stop bit, or more commonly seen as 19200,8,N,1. After setting up the terminal program, apply power to the SIMSYNC. The LED on the front panel labeled PWR indicates that DC power is successfully making it to the controller. There is an LED marked GPS that flashes every time a GPS string is received from the GPS receiver, so you should see this flashing at a 1 second interval. The LED called out as SYNC turn’s on when a time update is being sent to the Eagle Traffic Controller. If the terminal program is set up correctly, you will see a sign-on message that displays all of the current settings when DC power is applied. It is after the sign-on message where configuration commands are entered. The table below explains those commands. A couple of notes, the characters typed in the terminal screen do not echo back, so you will not see anything until ENTER is pressed. If a command is entered incorrectly, or the parameter entered is out of the allowed range, it will return ERROR. When a valid command with a valid parameter is 2 of 5
Traffic Control Synchronization System (SIMSYNC-M34) rev 5.0 SIMREX Corporation entered, the value is displayed at the PC, is stored in non-volatile flash memory and the SIMSYNC firmware is restarted with the new value. If you change the baud rate, remember to change the baud rate at the PC. Note that the GPS positioning unit is not rebooted when changing SIMSYNC parameters. Also, unless the GPS baud rate is changed in the GPS receiver itself, you should not change it at the SIMSYNC terminal screen. A few of the key commands explained in detail: sync
This setting determines the type of synchronization, ‘once-a-day’ or at an ‘Interval’. The default setting is interval, or 1. To set a ‘once-a-day’ update, the value is 0. To set this value, at the terminal screen, enter sync=0 or sync=1, and then press ENTER.
time
The time setting, displayed on the terminal screen as synctime, is used to tell the SIMSYNC when, or how often, to send the time update to the Eagle Controller, based on the sync setting above. The time is entered in seconds. The default setting from the factory is 5 seconds.
These two settings determine the main synchronization pattern of the SIMSYNC unit. If the sync setting is 0, or once-a-day, the time setting refers to the number of seconds past midnight that the unit will update the time. If time is set to 60, the time update will be sent to the Eagle controller at 12:01:00 AM. If it is set to 7200, the update will be sent at 2:00AM. When the type is set to 1, or interval, it updates the time every time seconds after power up. To update every 12 hours, set the sync=1, and set time=43200, this will update every 12 hours after the unit is powered up.
SIMSYNC-M34 COMMANDS Note: All commands are lower case text and there must not be any spaces between the equal sign.
Command Description
Values
Example
eaglebaud
Sets the baud rate for the Eagle port on the SIMSYNC unit
4800/9600/19200 bps
baud=19200
gpsbaud
Sets the baud rate for the GPS port on the SIMSYNC unit
4800/9600/19200 bps
baud=19200
1 or 0
sync=0
from 1 to 86400 seconds
time=14400
Synchronization Type sync
0 = Once a day (time seconds after midnight) 1 = Interval (every time seconds) Synchronization Time
time
This is the time that the synchronization will occur. This value is in seconds. If you want to synchronize every hour on the hour enter 3600 and set the synchronization type to interval (1). If you need to synchronize at 4:00 am everyday enter (4 * 3600 sec/hour = 14400) and set the synchronization type to once a day (0) 3 of 5
Traffic Control Synchronization System (SIMSYNC-M34) rev 5.0 SIMREX Corporation Time Zone The tz command sets the time zone. The value you enter should not include any offset for daylight savings time. GMT = 0 Eastern Standard Time = -5 tz
Central Standard Time = -6
-12 to +12 hours
tz=-6
1 or 0
dst=1
(no parameters)
verbose
Mountain Standard Time = -7 Pacific Standard Time = -8 Alaska = -9 Hawaii = -10 For those of you in Nuku’alofa (GMT -13) you’re out of luck! Daylight Savings Time flag dst
0 = NO Daylight Savings Time calculated 1 = Daylight Savings Time
verbose
Displays on the user config port, the GPS data being sent into the SIMSYNC
monitor
By entering this command, each binary output message sent to the traffic controller will be displayed on the user port terminal in hex form. This consists of 2 lines. The first is the preamble sent to the controller, followed by the new time data.
Monitor
quiet
This tells the SIMSYNC not to display any messages on the terminal screen
Quiet
msg
Use this command to set the standard 22 byte output (1) message, or the short 20 byte output (0) message
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1 or 0
msg=1
Traffic Control Synchronization System (SIMSYNC-M34) rev 5.0 SIMREX Corporation GPRMC MESSAGE FORMAT The $GPRMC message that the GPS transmits looks like this: $GPRMC,144737,A,3842.6234,N,09649.0585,W,012.5,353.2,060702,005.2,E*67 The fields are mapped as follows: $GPRMC,POS_UTC,POS_STAT,LAT,LAT_REF,LON,LON_REF,SPD,HDG,DATE,MAG_VAR,MAG_REF*CC POS_UTC POS_STAT LAT LAT_REF LON LON_REF SPD HDG DATE MAG_VAR MAG_REF CC
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UTC of position. Hours, minutes and seconds. (hhmmss) Position status. (A = Data valid, V = Data invalid) Latitude (llll.ll) Latitude direction (N = North, S = South) Longitude (yyyyy.yy) Longitude direction (E = East, W = West) Speed over ground. (knots) (x.x) Heading/track made good (degrees True) (x.x) Date (ddmmyy) Magnetic variation (degrees) (x.x) Magnetic variation (E = East, W = West) Checksum (optional) Sentence terminator.
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