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7.5.1
Configuring COM1A/COM1B as RS232/RS485/TTY interface
7.5.2
Configure COM2 as an RS485/TTY interface
∗
The value of the terminating resistor for the RS485 interface is 120 Ω. If the terminating resistor is switched to OFF, the
value is ∞.
Siemens Building Technologies
Fire Safety & Security Products
1.
Configure COM1A as an RS232 interface and COM1B as a TTY interface/
RS485.
The settings of DIP switch SW401 can be found in Tab. 6.
RS232 interface
TTY interface
RS485 interface
without terminating resistor
RS485 interface
*
with terminating resistor
Control unit interface COM1A/COM1B (SW401):
Tab. 6
Interface configuration
1.
Configure COM2 as an RS485/TTY interface.
The settings of DIP switch SW301 can be found in Tab. 7.
RS485 interface without
*
terminating resistor
RS485 interface with terminating
*
resistor
TTY interface
Signal transmitter OFF
Signal transmitter ON
X Any switch position.
Telemetry interface COM2 (SW301):
Tab. 7
Interface configuration, signal transmitters
1
2
3
OFF
ON
OFF
OFF
OFF
ON
ON
OFF
OFF
∗
ON
OFF
OFF
1
2
3
ON
OFF
ON
ON
OFF
ON
OFF
ON
OFF
x
x
x
x
x
x
Description of the device
4
5
6
7
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
ON
4
5
6
7
OFF
OFF
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
OFF
x
x
x
x
x
x
x
x
8
OFF
OFF
OFF
ON
8
x
x
x
OFF
ON
21
03.2009
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