Elmo ESD-CC1 - Manual (Page 20)

5. Troubleshooting
When you get trouble with using the keyboard, please follow the procedures below to isolate the problem before call
back to the installer.
A. Nothing or wrong text is displayed on LCD.
Possible causes and countermeasures:
a. No power or unstable power source: check the output of the DC12V adapter is correct or not.
b. Interference comes from peripheral devices: disconnect the RS-485/422 and RS-232 connectors and re-start the
keyboard. If the keyboard works fine now, then we can conclude some of the other device cause the trouble,
please connect the installer to solve the problem.
B. Device Link-up problem
Possible cause and treatment:
a. The keyboard RS-485 cable connection is not secure: please make sure the cable is firmly connected on both the
keyboard side and device side.
b. Wrong start-up procedure: some peripheral devices (as P/T/Z/F dome cameras) need longer initial time after
power on. They can not recognize the linking command during the initial time. Please make sure that all the
peripheral devices have been powered-up before applying power on the keyboard.
c. RS-485 cable open or short: please separate each device and find out which segment of the communication you
can connect single keyboard and device to confirm this possible cause. Please connect the concerning people and
tell them this test result.
C. One or some devices lose control
Possible cause and treatment:
a. The bus does not connect to those peripheral devices: please check the RS-485 cables on those peripheral sides
and make sure those cables are connected perfectly.
b. Malfunction of the peripheral devices: you can connect one keyboard to one device to confirm the proper
functioning of the device.
c. One of the RS-485 cable segments open or short circuit: disconnect the cable segment and locate the failure
segment. Please connect the installer for support.
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