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RC4000 Antenna Controller
Appendix REM
Remote Control Option
4.0 TROUBLESHOOTING
No Communication between RC4000 and the remote control computer. There are numerous
situations that could cause no communication:
1) The address set in the RC4000 is not being used by the remote commands. Check the address in the
REMOTE configuration screen and ensure that address is being sent with the commands. Incorrectly
addressed commands will be ignored by the RC4000.
2) The baud rate set in the RC4000 is not being used by the remote commands. Check the baud rate in
the REMOTE configuration screen and ensure that it is the same as being used by the remote computer.
Commands sent at the incorrect baud rate will not be recognized by the RC4000.
3) The remote computer or RC4000 are not both set to RS-232 or RS-422/RS-485. The remote control
system should determine whether it is to work in RS-232, -422 or -485 mode. Check the configuration of
the remote jumper and the placement of the cable inside of the RC4000, as described in 2.2.11. Also
check the cabling between the RC4000 and the remote computer.
4) The RS-422 adapter is not compatible with the RC4000. Occasionally it has been found that a
commercially available RS-422 adapter will just not work with the RC4000. To check for this possibility,
temporarily mechanize the interface via RS-232 and see if communications is established.
5) The remote computer is not actually transmitting through the intended communication port. To check
for this possibility, mechanize a "loop back" right at the communication port of the remote computer. The
receive mode of the remote control software should see an exact reflection of the transmitted command.
Unreliable Communications or ACU Reset. There are some situations that may cause the remote
control communications to be unreliable (such as a garbled status reply) or in the extreme situation to
cause the ACU to reset.
1) The general recommendation is not to send commands (particularly status requests) at a rate greater
than once a second.
2) Don't repeatedly ask for "static" information such as navigation or satellite data.
3) Allow a previous command to ACK or NAK before sending another command.
REM-41
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