6-4
LaserSpeed Pro 8500-4 Instruction Handbook: RS-232/RS-422 Communication
The COMM LED indicates the baud rate for each port 4 times. Each series of blinks is separated by a pause
of a few seconds. The RS-232 baud rate is indicated by blinking Orange, and the RS-422 baud rate is indi-
cated by blinking Blue.
For example: if the RS-232 port is configured for 38.4kBaud, 7N2, and the RS-422 baud rate is set to 115.2k,
8N1, the COMM light will blink 4 sets of 4 Orange blinks with the Valid LED turned OFF, followed by 4 sets of
2 Blue blinks with the valid LED turned ON.
6.3.1
Automatic Baud Rate Detection
The LS8500-4 can automatically detect the baud rate and framing that you are using. It is not necessary to
set the baud rate of the LaserSpeed Pro except for its power-up baud rate setting used for the power-up
streaming output modes.
At power-on, the LS8500-4 loads the Baud Rate & Framing settings for the RS-232 and RS-422 serial ports
from non-volatile memory and then listens for commands. If a carriage return (hex 0x0d) is received at a baud
rate other than the gauges power-on baud rate setting, the gauge switches automatically to the measured
baud rate. The gauge will use this baud rate until a new baud rate it detected.
6.4 Communication Protocol
This section lists the commands used to configure the LS8500-4, and to read measurement data. Throughout
this section,
<CR>
is used to denote a carriage return, and
<LF>
is used to indicate a linefeed.
Notation
Description
<CR>
Carriage Return character
ASCII Value: 13
<LF>
Linefeed character
ASCII Value: 10
<N>
Integer Value (variable length)
Indicates an integer value with length from 1 to 9 char-
acters. When sending a command to set a configuration
setting, the transmitted value can contain leading zeros,
but they are not required. When reading a configuration
setting, the LS8500-4 will not transmit leading zeros in
its response.
Example Notation: L<N><CR>
Example Command: L100000<CR>
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