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Page 23 MNNCEKRKB1_0439
4.13 Autotest o f serial channels
In the case of faulty operation or to check the keyboard, it is possible to carry out a simple test to make sure the
communication channels to the video device and the telemetry are working perfectly.
Disconnect any devices connected to the V, A and B lines and make up the following test cable, using two
telephone cables and two RJjack boxes supplied with the keyboard:
Phone cable RJjack 1 RJjack 2 Phone cable
RS485A White White RS485A
RS485B Yellow Yellow RS485B
Warning: this cable is different from the standard connection cable described in § 3.3 - Standard
connection cable, page 12.
4.13.1 Autotest pr ocedure
• Connect the cable to connectors A and B
• Connect the cable to connectors A and V
• Connect the cable to connectors B and V.
The display shows .
This means that input and output communication lines for the two
lines are functioning correctly.
Other types of message mean that the connecting cable is
incorrect or that the test lines are not working. In the example
channel A is able to transmit and B receives correctly, but
communication is only in one direction.
The third line shows the results of the test: , and stand
for the three lines - Video, Telemetry B and Telemetry A
respectively.
For each line, A, B and V, one of the following messages will be shown:
: the line is not working and is unable to transmit or receive data
: the line is able to transmit but not receive
: the line receives but is unable to transmit
: the line transmits and receives correctly.