Thermo Scientific 49i, Instruction Manual, Page: 250 / 314

C-Link Protocol Commands
Instrument Identification Number
B-2 Model 49
i
Instruction Manual Thermo Fisher Scientific
• “I/O Configuration” on page B-39 describes and gives examples of the
I/O commands.
• “Record Layout Definition” on page B-43 describes and gives examples
of the record layouts.
Instrument
Identification Number
Each command sent to the analyzer must begin with the American Standard
Code for Information Interchange (ASCII) symbol or byte value equivalent
of the instrument's identification number plus 128. For example, if the
instrument ID is set to 25, then each command must begin with the ACSII
character code 153 decimal. The analyzer ignores any command that does
not begin with its instrument identification number. If the instrument ID is
set to 0, then this byte is not required. For more information on changing
Instrument ID, see Chapter 3, “Operation”.
Entering Units in PPB
When interfacing to an instrument via C-link commands, always enter the
concentration values in ppb or
μ
g/m
3
units. For example, to set a
background value to 20 ppm, enter 20000 (ppb) as the value for the set
background command.
Accessing Streaming
Data
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 a connection is made on TCP port 9881.
Commands
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 170 decimal, which directs the command to the
Model 49
i, and is terminated by a carriage return “CR” (ASCII character
code 13 decimal).
<ASCII 170> T I M E <CR>