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Pelco Manual C540M (6/98) 35
Appendix C. Keyboard Connector Pin-Outs (Continued)
I
2
C Bus Port
This special port will be used in future for expansion of keyboard func-
tionality - it is not available for use as a general purpose serial commu-
nications port. These I/O lines are connected to six-pin RJ socket JP4
as shown below.
Relay Port
Supported by Relay RE1 and RE2 as defined by user (1 Amp internal
relay rating). Relay contacts appear at six-pin RJ socket JP5, and are
connected as follows:
JP4 Pin Function
6 +5 VDC Out
5 +5 VDC Out
4 Gnd
3 SDA In/Out
2 Gnd
1 SCL In/Out
JP5 Pin Function
6 RE2 Normally Open
5 RE2 Normally Closed
4 RE2 Common
3 RE1 Normally Open
2 RE1 Normally Closed
1 RE1 Common
PIN 1
DIP SWITCHES
RESET
BUTTON
VOLUME
RELAY 1
2
C COM 3 COM 2 COM 1