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RS 232 interface
10
The 9-pole RS 232 interface on the front panel
is used for setting the control module via a PC.
The entire serial communication of the feeder
terminals goes over the control module. This
means that also the relay modules of the feeder
terminal are set via the RS 232 interface of the
control module.
If a PC is connected to the RS 232 interface the
RS 485 interface on the rear panel of the feeder
terminal is disconnected. The use of the RS 232
interface requires a SPA bus protocol.
RS 232 interface of SPTO 6D3
Signal name
Pin number
9-pin male conn. 9-pin fem. conn. 25-pin male conn.
Data receive, Rx
Data transmit, Tx
Earth
DSR
DTR, +12 V
Pin 4 of the RS 232 interface of the control
module SPTO 6D3 can be used for feeding
supply voltage to an optic modem. An optic
modem may be necessary between the control
The following serial communication param-
eters should be used:
- Number of data bits, 7
- Number of stop bits, 1
- Parity, even
- Baudrate, 9.6 kilobauds as a default
The table below shows the signal names and pin
numbers of the cable to be used between the RS
232 interface and the device used for setting.
Pin number
2
3
3
2
5
5
6
4
4
-
module and the programming device if the
possible potential difference cannot be elimi-
nated.
Setting device
Pin number
Signal name
2
Data transmit, Tx
3
Data receive, Rx
7
Earth
20
DTR
-
-
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