Pelco C540M (6/98) Appendix C. Keyboard Connector Pin-OutsContinued, Pelco Manual C540M 6/98

Appendix C. Keyboard Connector Pin-Outs (Continued)

	VOLUME
RELAY 12C COM 3 COM 2 COM 1	RESET	DIP SWITCHES

BUTTON

I2C 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.

JP4 Pin	Function
6	+5 VDC Out
5	+5 VDC Out
4	Gnd
3	SDA In/Out
2	Gnd
1	SCL In/Out

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:

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

Pelco Manual C540M (6/98) 35