EverFocus EKR-KB1 - Handbuch (Seite 25)

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.