Remote Access Gateway IGW/920 - First Steps
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E M B E D D E D
S Y S T E M S
21
12 PINOUT SCREW TERMINALS
The table 6 shows the pinout of the screw terminals of the IGW/920.
Pin USB
COM1
COM2
Power
RS232
RS232
RS422
RS485*
A1 VCC
V+ IN
A2
GND IN
A3 USB+
A4 USB-
B1
RTS
B2
TXD
B3
RXD
B4
CTS
C1 Sig. GND Sig. GND Sig. GND Sig. GND Sig. GND
C2
RXD
C3
TXD
C4
D1
RX+
D2
TX+
RX/TX+
D3
RX-
P3
P2
P1
PWR
A
B
C
D
1 2 3 4
D4
TX-
RX/TX-
= Cable bridge
Table 6:
Pinout of the screw terminals
* Please note: The RS485 (officially called TIA/EIA-485-A) connection between
your IGW/920 and the field devices needs termination resistors on both ends for
proper operation. The IGW/920 does not offer internal termination resistors. Please
make sure, that the RS485 cable connection is equipped with external termination re-
sistors.