b) Table of data connector RS422 connections
Tab. 3.2: Table of data connector RS422 connections
DSUB9F
pin
Screw
terminals
RS422
signal
7
1
TxD-
3
2
TxD+
8
3
RxD-
2
4
RxD+
5
5
GND
c) Connection diagram of data cable RS485
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 (+)
line B (–)
2
7 6
3
8
9
1
4
5
Screw terminals for RS485
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 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 conductors 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 router (approx. -6V when inactive) and TxD is the input to the
router (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.
Tab. 3.3: Table for distinguishing LEDs for RxD and TxD by colour
Colour (RxD / TxD)
Type of interface
red / green
RS232
orange / green
RS232 opt. separated
orange / yellow
RS422/485 opt. separated
Narrowband modems – PROFIMD400, MD300, MD160 – © RACOM s.r.o.
10
Connectors
Summary of Contents for MD400
Page 2: ......
