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C-Link Protocol Commands
Commands
Commands
Accessing Streaming
Entering Units in
B-2
Model 43i Trace Level-Enhanced Instruction Manual
The analyzer must be in the remote mode in order to change instrument
parameters via remote. However, the command "set mode remote" can be
sent to the analyzer to put it in the remote mode. Report commands
(commands that don't begin with "set") can be issued either in the remote
or local mode. For information on changing modes, see Chapter 3,
"Operation."
The commands can be sent in either uppercase or lowercase characters.
Each command must begin with the proper instrument identification
number (ASCII) character. The command in the example that follows
begins with the ASCII character code 171 decimal, which directs the
command to the Model 43i Trace Level-Enhanced, and is terminated by a
carriage return "CR" (ASCII character code 13 decimal).
<ASCII 171>
If an incorrect command is sent, a "bad command" message will be
received. The example that follows sends the incorrect command "set unit
ppm" instead of the correct command "
Send:
Receive:
The "save" and "set save params" commands stores parameters in FLASH.
It is important that each time instrument parameters are changed, that this
command be sent. If changes are not saved, they will be lost in the event of
a power failure.
Streaming data is sent out the serial port or the Ethernet port on a user-
defined periodic basis. Streaming data over Ethernet is only generated when
Data
a connection is made on TCP port 9881.
When interfacing to an instrument via C-link commands, always enter the
concentration values in ppb or μ g/m
PPB
background value to 20 ppm, enter 20000 (ppb) as the value for the set
background command.
Table B–1 lists the 43i Trace Level-Enhanced C-Link protocol commands.
The interface will respond to the command strings outlined below.
Table B–1. C-Link Protocol Commands
Command
addr dns
T I M E <CR>
set unit ppm
set unit ppm bad cmd
3
units. For example, to set a
Description
Reports/sets dns address
."
set gas unit ppm
Thermo Fisher Scientific
Page
B-34
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Troubleshooting
