Operating Modes and Character Recognition
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002)
4-21
In the "Test send RS485" test operating mode the MD2 modem continuously
outputs a short message with a character string in asynchronous 11-bit format to
the WAN port and the RS485 interface.
The test operating mode "Test send RS485" is signaled by the "RXD" LED that
flashes synchronously to the selected baud rate (please consider: as of 2400 bps
any flashing can hardly be recognized). All other LEDs stay of.
If the short message is now correctly received by the opposite MD2, that MD2 will
signalize this by its "RXD" and "DCD" LEDs that both are flashing synchronous to
the selected baud rate. If the "RXD" and "DCD" LEDs stay off or if the "DTR" and
"CTS" LEDs are continuously lit ; then this indicates an incorrect data reception or
the reception of single errrors in the received character string. Further notes to this:
see section Test Operating Mode "Test receive". For possible causes: see section
Possible Error Causes.
The following illustration shows the setting on the 10-pin DIL switch of the MD2 for
the "Test send RS485" operating mode.
Fig. 4-16 DIL switch setting for the
"Test send RS485" operating mode
1234
OFF
ON
5
6789
10
To Next Page
Loading...
