Exacom VCR-2020 Specifiche Scaricare il pdf (Pagina 30)

EXACOM VCR-2020

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Appendix B: Serial Data Input for the VCR-2020

The VCR-2020 Server is equipped with two serial communications ports. Either port

can be connected to either a Time Sync signal or and ANI data source. The typical

serial cable connection is shown below. Note that each serial port will default to 9600

Baud unless the connection shown between pins 7 & 9 is made.

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B.1 Time Synch

Two different time sync protocols are accepted by the VCR-2020. The first is a simple

ASCII format found at some early PSAP installations. It has the format:

................. ‘TTRhhmmssF’

where ‘TTR’ identifies the format, ‘hh’ is two hour digits, ‘mm’ is two minute digits,

and ‘ss’ is two seconds digits. Leading zeros must be supplied. The ‘F’ is the final

synchronizing character, when it is received, the time will be entered into the system

clock.

The second protocol actually includes three variations (modes 0, 1, and 2) of the

Spectracom formats.

ANI over a serial port is typically sent using 9600 BAUD. Some systems however

transmit the ANI information at other BAUD rates. AS an Example AT&T uses 1200

BAUD.

Time synch is received at 9600 BAUD and is the default configuration.

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Exacom VCR-2020 Specifiche Pagina 30