Operating Modes and Character Recognition
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002)
4-19
In the "Test send" 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 thus to the 2-wire dedicated line.
The test operating mode "Test send" is signaled by the "TXD" and "RTS" LEDs that
both flash 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" operating mode.
Fig. 4-14 DIL switch setting for the
"Test send" operating mode
1234
OFF
ON
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