Communications support modules
Hardware - SIMADYN D 6-29
Edition 12.2004
6
6.7 Interface module SS31
6DD1688-1AC1
The SS4 communications module can be equipped with an RS 485
interface to establish a USS bus connection using the SS31 interface sub-
module.
The interface module is a 40 pin (dual-in-line) hybrid device which can be
inserted in the socket provided on the SS4 communications module.
When inserting the module, ensure that it is correctly aligned: The recesses
of the socket of the interface module (or pin 1, marked with a point) and the
socket on the SS4 (X51) must coincide.
• data transfer rate up to 1 Mbaud
• max. cable length dependent on the baud rate:
200 m at 1 Mbaud
• no terminating resistor
To enable the transmitter, the RTS signal must be set to „1“.
This enable signal is generated using an appropriate jumper in the
connector of the SS4 communications module.
6.7.1 Pin assignment
Pin No Function Pin No Function
1 Not assigned 21 0V
2 0V 22 0V
3 5V 23 -TxD
4 0V 24 +TxD
5 Not assigned 25 Not assigned
6 DCD 26 +RTxC
7 0V 27 -RTxC
8 RTS 28 +DCD
9 Not assigned 29 -DCD
10 TxD 30 +RxD
11 TRxC 31 -RxD
12 RxD 32 5V
13 RTxC 33 5V
14 Not assigned 34 Not assigned
15 -RTS 35 0V
16 +RTS 36 0V
17 -TRxC 37 Not assigned
18 +TRxC 38 Not assigned
19 Not assigned 39 Not assigned
20 Not assigned 40 Not assigned
Order No.
Description
Features
Enabling the
transmitter
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