INFICON HLD6000 Refrigerant Leak Detector Interface Description - Manual (Page 37)

Trouble Shooting 37
5 Trouble Shooting
5.1 Serial Communication via RS232 (common)
5.2 ASCII Protocol specific
Error Possible Reason Solution
No characters are received
via the interface/the leak
detector does not answer Wrong cable Please use a 1:1 cable, (NO null-modem cable, also
called cross-over cable!)
Problems with flow control Deactivate flow control in PC/PLC or use cable
according to the wiring diagram in chapter 4 of the
IO1000 documentation.
Wrong COM-Port used at
PC Select correct COM-Port
No characters are received
via the interface/the leak
detector does not answer Wrong interface
parameters (Baud rate,
Data bits, Parity, Stop bits) Check if interface parameters (Baud rate, number of
data bits, parity bit and number of stop bits in the leak
detector and PC/PLC match)
Wrong protocol selected in
the leak detector Select correct protocol in the leak detector
PC uses an USB-RS232
converter In general the IO1000 will also work with an USB-
RS232-converter. However, these often cause
multiple difficult to track problems (driver, flow
control.) Please test your PC program on a “real”
RS232 interface first preferably. Especially with
USB-RS232-converters it is often helpful to use a
cable according to the wiring diagram in chapter 4 of
the IO1000 documentation.
Serial interface of PC is
(still) occupied with a
different program Check if other programs uses the serial interface. It
is also possible that an already closed program has
not released the interface again yet. In this case a
restart of the PC will help.
The leak detector replies with
“unreadableˮ characters Wrong interface
parameters (Baud rate,
Data bits, Parity, Stop bits) Check if interface parameters (Baud rate, number of
data bits, parity bit and number of stop bits in the
IO1000 and PC/PLC match)
Wrong protocol selected in
the leak detector Select correct protocol in the leak detector
Error Possible Reason Solution
IO1000 does not reply/leak
detector replies after several
command with “E10ˮ “Carriage Returnˮ at the
end of the command is
missing Finish all commands with “Carriage Returnˮ
(ASCII 0dhex/13dez)
leak detector replies with
error message to the first
command only, following
commands are interpreted
correctly Receiving buffer of the leak
detector was not empty
before sending the first
command (e.g. by plugging
in the RS232 cable during
operation) In the ASCII protocol the leak detector has not time
out function which will empty the receiving buffer
automatically. Therefore, the buffer should be
emptied before the first command by sending of
ESC, ^C or ^X