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3
Configuring the short range galvanic
modem
Configuring the short range galvanic modem
No setting is available for the short range galvanic modem on the HMI. There are how-
ever some that can be made on a DIP-switch located behind the cover around the line
connector at the back of the terminal according to figure 11. After the connector has
been disconnected, if attached, the cover plate can be removed just by pulling at the
middle of the cover plate. No settings are located on the circuit board.
Line
connector
Cover
plate
Figure 11: Setting and indications for short range galvanic modem
Only switch 1 and 2 are used on the DIP-switch. The function is according to the setting
of timing signal, see table 4. In normal operation switch 1 is set in ON position at one
end and switch 2 is set ON at the other end. The rest of the switches is set OFF.
Table 4: Setting of timing signal
Switch no.
Function
1
2
OFF
OFF
Unpredictable, normally locally created timing
OFF
ON
Timing recovered from received signal
ON
OFF
Locally created timing
ON
ON
Timing recovered from received signal
There are also some indication for supervision of the communication channel that can
be seen when the cover around the fibre optic connectors is removed. These LED's are
found below the DIP-switch. The function of the LED's are explained in table 5.
1
2
Off
On
3
1
4
2
5
3
4
DCD
RD
TD
xx00000555.vsd
Chapter 8
Configuring the digital
communication modules
49
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