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b) Table of data connector RS422 connections for Radio modems
Tab. 3.2: Table of data connector RS422 connections
DSUB9F
pin
Screw
terminals
RS422
signal
71TxD-
32TxD+
83RxD-
24RxD+
55GND
c) Connection diagram of data cable RS485 for Radio modems
When you are connecting RS485, your “A” has to be connected to TxD+ and RxD+ simultaneously
and “B” to TxD- and RxD- simultaneosly.
line A (+)
lineB(–)
2
7 6
3
8
9
14
5
ScrewterminalsforRS485
DSUB9F
1
lineB
line A
SCC
2 3 4 5
RS485
RS485
Fig. 3.2: Data cable RS485 connections
Note
For data connector RS485 connection see Table of data connector RS422 connections.
Important
For making data cables for connecting the user´s terminal equipment to the modem´s serial
port we recommend using a shielded cable, particularly in an industrial environment, and
connecting the shielding to GND (pin No. 5). When using a multi-core cable all free conduct-
ors should be connected to pin No. 5. In the case of a galvanically separate port for RS485
(RS422) only ground one side of the data cable. We recommend using only the necessary
minimum length for data cables.
3.2.2. Distinguishing Data Modules by Colour
For RS232 RxD is the output from the radio modem (approx. -8V when inactive) and TxD is the input
to the radio modem (according to the RS 232 standard). Hardware versions of the interface can be
distinguished according to the colours of LED diodes next to the connector.
Wideband modems – PROFI MX160 – © RACOM s.r.o.10
Connectors