Eaton SWIRE-GW-MB, Manual, Page: 21 / 67

Connecting MODBUS RTU
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07/09 MN03407002Z-EN
The following table lists the signals of SWIRE-GW-MB.
Table 3: Signals SWIRE GW-MB
Data transfer with RS485
If you are using the RS485 communication standard, pins
5,6, 8 and 9 of the gateway’s D-sub socket are used for data
transfer. The Table 4 below lists the pin functions and
assignments of the 9.pin D-sub connector.
Pin Signal name Designation
1 Not used –
2 RxD out RS232 transmit
3 TxD in RS232 receive
4 Not used –
5 GND Reference potential
6 + 5V + 5V, electrically isolated
7 Not used –
8 Rx/Tx – (A-Line) RS485 receive/Send data N
9 Rx/Tx + (B-Line) RS485 receive/Send data P
h
Caution!
For communication through RS485 use only pins 5,6,8 and
9! Using preassembled data cables that use pins 2 and 3
can damage the SWIRE-GW-MB or the other connected
device.