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4.1.6
Test Operating Modes
The MD2 modem features several test operating modes to help in the installation
and testing of the modem's functions. The following test operating modes are
offered:
· Test operating mode Test f
· Test operating mode Test f
· Test operating mode Test f
· Test operating mode Test f
· Test operating mode Test send
· Test operating mode Test send RS485
· Test operating mode Test receive
Table 4-2
Test operating
mode at
sending site
Test f
1
L
Test f
2
H
3
Test f
baud
Test send
4
Test send RS485
5
Test f
6
H constant
For the test variants 1 to 5 the test result can be read from the LEDs on the
receiving MD2. Except for the modems themselves no other devices are required
here.
Only for test variant 6, that is used for level measurement, an appropriate
measuring device is needed. However, in most cases a normal voltage measuring
device will be sufficient.
For the correct execution of a test it is required that all of the modems, that are
provided for the ultimate layout, are connected to the telecontrol line and are
correctly configured (baud rate, 2-wire/4-wire, terminating resistor, RS232/RS485
port, operating mode, etc.). There are several possible causes, if the test result is
negative. Some notes to this can be found below under Possible Error Causes.
All options for the dedicated line properties can be selected but the character
recognition method must be set to either "Asynchronous 10" or "Asynchronous 11".
© Siemens AG 2002 All Rights Reserved
MD2 Modem (07/2002)
L
H
baud
H constant
Summary of the test operating modes
(Test) operating
mode at
receiving site
Normal
Normal
Normal
Test receive
Test receive
Normal
Operating Modes and Character Recognition
Suitable for
Verification whether sufficient receive level is
available (only for the lower keying frequency)
Verification whether sufficient receive level is
available (only for the upper keying
frequency)
Verification whether sufficient receive level is
available (for the lower and upper keying
frequency simultaneously)
Testing the function of the receiving modem
(detection of a sequence of characters)
Like 4, however for a star shaped dedicated
line network.
For level measurement only. Appropriate
measuring device required.
6NH7811-0AA22
4-9
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