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5-1
2103 Modem Module
Section 5 Modbus Protocol
Sections 5.1 through 5.5 give an overview of the basic capabilities
and operation of Modbus protocol as it applies to Isco 2100 Series
flow modules.
For a Glossary of Terms and Common Acronyms, see sections 5.4
and 5.5.
For Modbus technical specifications, turn to section 5.6.
5.1 Introduction Modbus is a simple command/response mechanism to read from
and write to specific memory locations called registers. A register
is a holding place for a piece of digital information within the
equipment. There are three standard protocols for Modbus:
Modbus RTU, Modbus TCP/IP, and Modbus ASCII. The Isco 2100
Series devices use Modbus ASCII protocol, the metho [(vwssme)-4.6d0
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