EXACOM
VCR-2020
Copyright 1991, 92, 93, 94, 95, 96 all rights reserved by EXACOM, Inc.
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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.
