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12
SymNet1
User Manual
Audio and alarm connections
To add alarm, audio, and RS-485 connections, wire the 20-way terminal block as shown in Figure 7.
Figure 7. I/O Port pin numbering
The side of the SymNet1 is equipped with an accessories I/O Port (20-pin connector). Wire all I/O devices to
the 20-way terminal connector that was supplied with the unit. Connect the terminal connector to the I/O port.
Do not attempt to wire accessories directly to the I/O port. If the terminal connector is lost or missing, contact
GE Customer Service for a replacement.
Table 2 describes the 20-way terminal connector.
Table 2.
20-way terminal connector
Pin number
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Pin 10
RS-485 solution wiring
To set up a two-wire bidirectional RS-485 connection to control a DVMRe or a KTD-405, do the following:
1. Connect a wire from pin 11 (TX+) to pin 13 (RX+) on the 20-pin terminal block.
2. Connect a wire from pin 12 (TX-) to pin 14 (RX-) on the 20-pin terminal block.
3. Connect a wire from the RS-485+ pin on the DVMRe or KTD-405 to pin 11 or 13 on the SymNet1
terminal block.
4. Connect a wire from the RS-485- pin on the DVMRe or KTD-405 to pin 12 or 14 on the SymNet1
terminal block.
1
2
11 12 13 14 15 16 17 18 19 20
Description
Ground
Alarm in
Ground
Alarm out
Ground
Audio in
Ground
Audio out
Ground
Ground
3
4
5
6
7
8
9
Pin number
Pin 11
Pin 12
Pin 13
Pin 14
Pin 15
Pin 16
Pin 17
Pin 18
Pin 19
PIn 20
10
Description
RS-422/485 TX+
RS-422/485 TX-
RS-422/485 RX+
RS-422/485 RX-
RS-232 TXD
RS-232 RXD
RTS
CTS
DCD
RS-232 ground
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