Siemens OCI600 - Communication Via RS-232 Port

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Building Technologies User Manual OCI600 74 319 0002 0 c
HVAC Products Communication and delivery of alarms 15.07.2005
5.2 Communication via RS-232 port
Topology of a plant with direct communication via the RS-
232 port.
The following illustration shows wiring with the standard null
modem and the link cable.
Standard null modem
cable
Link cable
25 pins 9 pins
25 pins 25 pins
Female Female
2861Z06
1
2
3
4
5
6
7
8
20
1
2
3
4
5
6
7
8
20
2861Z07
7
2
3
4
5
6
22
8
20
5
2
3
1
4
4
9
7
6/8
Standard null
modem and
link cable