Operating Modes and Character Recognition
6NH7811-0AA22 © Siemens AG 2002 All Rights Reserved
4-22 MD2 Modem (07/2002)
Test Operating Mode "Test receive"
The "Test receive" test operating mode is used together with one of the test modes
"Test Send" or "Test Send RS485" (see previous sections).
The following illustration shows the setting on the 10-pin DIL switch of the MD2 for
the "Test receive" operating mode.
Fig. 4-17 DIL switch setting for the
"Test receive" operating mode
At the modem that has been set to this operating mode "Test receive", the result of
the test can be indicated as follows:
1. Indication: Both LEDs "TXD" and "RTS" flash synchronously to the selected
baud rate. All other LEDs are off.
Meaning: The MD2 receives the test character string correctly.
2. Indication: Both LEDs "TXD" and "RTS" flash synchronously to the selected
baud rate. In addition the "DTR" and "CTS" LEDs are continuously on.
Meaning: A character string is being received but an error has been detected.
The continuous lighting of the "DTR" and "CTS" LEDs is activated upon the first
detected error and then stored. The stored error can be reset via DIL switch 10
(see Fig. 4-18).
3. Indication: Only the LEDs "DTR" und "CTS" are continuously on. All other LEDs
are off.
Meaning: There is no character string being received or it is not at all
understood. "Test receive" can be reactivated at any time via DIL switch 10 (see
Fig. 4-18).
Execution of the reset:
Set DIL switch 10 to the ON position and then back to OFF.
Result:
The "DTR" and "CTS" LEDs will go off, "Test receive" is
restarted. If these LEDs go on again, a new error has been
detected in the received character string and is stored.
Fig. 4-18 Reset "Test receive"
1234
OFF
ON
5678910
1234
OFF
ON
5
6789
10
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