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LaserSpeed 8000-3 Instruction Handbook
Appendix E: Troubleshooting Guide
Part No. 93463 / Drawing No. 0921-01561 Page 208 of 221 Revision A (Sep 2007)
few commands to lock into the new baud
rate.
When using a terminal program,
all the data from the gauge prints
on the same line.
Terminal Program Settings The gauge terminates all transmissions
with a carriage return. Both a carriage
return and a linefeed are required for
HyperTerminal to start printing the next
transmission on a new line.
Enable the "Append line feeds to
incoming line ends" option in
HyperTerminal.
When using a terminal program,
only the first command after the
gauge is turned on returns a
response.
Terminal Program Settings The gauge expects all commands to end
with a carriage return. If you have the
"Send line feeds with line ends" setting
checked in HyperTerminal, when
you type the command, you are
transmitting "Z<CR><LF>" instead of
"Z<CR>", where <CR> is a carriage
return, and <LF> is a linefeed. The
gauge expects all commands to end with
a <CR>.
When you transmit:
Z<CR><LF>
Z<CR><LF>
Z<CR><LF>
Z<CR><LF>
The gauge sees it as:
Z<CR> ok, gauge responds
<LF>Z<CR> ignored
<LF>Z<CR> ignored
<LF>Z<CR> ignored
Because the first character in the
received command is invalid, each
command after the first one is ignored.
Disable the "Send line feeds with line
ends" option in HyperTerminal to fix.
Communciation problems:
Bad characters, intermittent
failures, etc…
Wiring
If using RS-232 over a long
cable, the baud rate may
too high.
Switch to RS-422 for
Make sure you are connected to the User
Ground (pin 11,19,21) and not the Power
Ground (pin 12,13).
Switch to a lower baud rate
RS-422 uses differential signals that have