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Connections
8
Connections
8.1
DC 12 V Connection
8.2
Control Unit Interface
104
Siemens Building Technologies
Fire Safety & Security Products
All connections are located at the rear (Fig. 2).
Connection of the DC power supply is protected against reverse polarity, and is
made using a two-pin plug. The power supply socket is included among the
accessories. The control unit can be connected using this accessory to any power
supply unit with DC 12 V/500 mA. Make sure that the output power of the power
supply unit is below 60 VA and the output current below 5 A.
It is recommendable to use the plug-type power supply unit listed in the
accessories (see Ordering data, Section 1).
Pin No.
Description
1
+
DC 12 V +10 %, -15 %, stabilized
(SELV)
2
-
Ground
Tab. 4
Pin assignments of power supply socket
Pin No.
Signal (description)
1
NC
Not used
2
Input
RxD
3
Output
TxD
4
NC
Not used
5
GND
Signal ground
6
NC
Not used
7
Output
RTS
8
Input
CTS
9
NC
Not used
Tab. 5
RS232 (COM1A), 9-pin Sub-D plug
Pin No.
Signal (description)
1
Output
TTY output I+
2
Output
TTY output I-
3
Input
TTY input I+
4
Input
TTY input I-
5
Input/output
RS485 line "A"
6
Ground
External GND
7
Supply
External V+ (15 V)
8
NC
Not used
9
Input/output
RS485 line "B"
Tab. 6:
Control unit interface TTY (COM1B), 9-pin Sub-D plug
01.2005
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