
IM-P198-02
MI Issue 5
29
4.2.7 RS485 communications
A single 2-wire RS485 half-duplex communications channel is provided, and can be used as
a Modbus RTU. Wiring is as shown in Figure 27.
Caution:
Please note that EIA standard 'B' and 'A' terminal labels are used, which are
opposite those used by some transceiver manufacturers (for example, Texas Instruments),
so care must be taken to not invert the polarity of the signal wires.
Note that by providing 2 pairs of terminals, the connections can be daisy-chained. Typically
one pair of wires would come from the previous node, and a separate pair of wires would
go on to the next node. In this case, the first paired cable would be connected to pins 1 and
4, and the second paired cable would be connected to pins 2 and 5.
Placing a jumper between pins 1 and 2 of connection 4 will make the RS485 port a
terminal port with 120 ohm resistor termination. This only needs to be done on 2 nodes
in the network. Pins 1 and 2 are the 2 pins farthest from connection 2.
4.2.8 Ethernet
The Ethernet connection is standard 10 /100 BaseT. Shielded twisted pair (STP) cable of
category 5 or greater is recommended. The termination is a standard RJ45 jack, and can
be connected to with readily available Ethernet cables or patch cords.
Fig. 27
1
RS485+ or B
2
RS485+ or B
4
RS485- or A
5
RS485- or A
3
Do not connect
RS485+
RS485+
RS485-
RS485-
GND_5VISO
Receiver
Driver
Содержание RIM10 Series
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