SSV IGW/922, Hardware Reference Manual

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Remote Access Gateway IGW/922 - Hardware Reference
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B o a r d R e v i s i o n 1 . 0 / M a n u a l R e v i s i o n 1 . 3
3 PINOUTS
3.1 Screw Terminals
The table 2 shows the pinout of the screw terminals of the IGW/922.
Pin Power COM2 Alarm
RS232 RS485*
A1 Alarm -
A2 Alarm +
A3 V+ IN
A4 GND IN
B1
B2 TXD RX/TX -
B3 RXD RX/TX +
B4 GND GND
Table 2: Pinout of the screw terminals
* Please note: The RS485 (officially called TIA/EIA-485-A) connection between
your IGW/922 and the field devices needs termination resistors on both ends for
proper operation. The IGW/922 does not offer internal termination resistors. Please
make sure, that the RS485 cable connection is equipped with external termination re-
sistors.