Serial Communications Page 7-
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Operating the Model 2010D Remotely using Command Mode
The Model 2010D currently supports several communications
protocols: Monitor Labs (ML), Dot Commands and Modbus. ML
Commands were used by Monitor Labs for interconnecting their
line of gas analyzers. It is a simple ASCII protocol that is
easy to implement. Dot Commands were developed by Dasibi
Environmental for their analyzers and calibrators and are used
in a number of air monitoring networks for interacting with gas
calibrators. Modbus is a standard industrial protocol that is
available in both ASCII and binary as well as embedded in
Internet protocols (Modbus TCP).
This section describes the ML Command protocol in detail and
presents descriptions of the commands available for remote
interaction with the Model 2010D. Please contact Sabio for
detailed descriptions of the Dot Command and Modbus protocols.
Within this section, the following conventions are used within
command descriptions.
X A single letter represents an ASCII character.
XXX Fields with all capital letters indicate fixed length fields.
{ } Curly brackets surround variable-length fields.
[ ] Square brackets surround optional fields.
< > Items enclosed by less/greater than brackets are non-printable characters.
, The comma is an ASCII comma character.
Spaces found within commands are not a part of the protocol.
The Monitor Labs Protocol
The Monitor Labs protocol is designed for interconnecting the
Monitor Labs line of air quality analyzers in a multi-drop RS232
network. This protocol does not normally support error
checking, however a data verification field will be appended to
the end of commands and responses if one of the data
verification methods is selected when setting up the command
mode options.
Fields in ML commands and responses can vary in length, making a
field separator necessary. By default, the comma character (2C
hex) is used as a field separator to indicate the end of one
field and the beginning of the next.
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