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RS232 interface
pin#
signal
1
TXD A
2
RxD A
3
DTR A
4
CTS A
5
GND
6
TXD B
7
RxD B
8
DTR B
9
CTS B
Operating modes
The Interface Modules are configurable for the following
modes using DIL switches, which are mounted on the modules:
RS232
The Interface Module converts all available TTL data and hand-
shake signals into RS232 signals. This mode provides one RxD
and TxD channel each in the respective direction, along with
six handshake channels (RTS, CTS, DSR, DCD, DTR and RI).
RS422
The Interface Module supports one data and one handshake
channel each (selectable DTR or RTS handshake output). The
RS422 sender/receivers are always active.
RS485
One data channel in each direction is always available in all
RS485 modes. These modes differ only in how the RS485
transceivers are controlled.
RS485 4-wire bus master
In this mode the master uses a conductor pair to send
requests to the slaves, which in turn send their replies to the
master on an additional common conductor pair. The RS485
transceivers are always active in this mode, whereby the master
can always send and is constantly listening for the slaves.
Subject to error and alteration
RS232(/422/485) Universal Serial T-Switch
RS422/RS485 interface
function
pin#
output
1
input
2
output
3
input
4
GND
5
output
6
input
7
output
8
input
9
signal
function
DCD
input
RxD
input
TxD
output
DTR
output
GND
GND
DSR
input
RTS
output
CTS
input
RI
input
9
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