Appendix C Modbus Protocol - Thermo Scientific 48i Instruction Manual

Communication
Parameters
Thermo Fisher Scientific
Appendix C
MODBUS Protocol
This appendix provides a description of the MODBUS Protocol Interface
and is supported both over RS-232/485 (RTU protocol) as well as TCP/IP
over Ethernet.
The MODBUS commands that are implemented are explained in detail in
this document. The MODBUS protocol support for the iSeries enables the
user to perform the functions of reading the various concentrations and
other measurement values, read the status of the digital outputs of the
analyzer, and to trigger or simulate the activation of a digital input to the
instrument. This is achieved by using the supported MODBUS parameters
listed below.
For details of the Model 48i MODBUS Protocol specification, see the
following topics:
"Serial Communication
●
"TCP Communication
●
"Application Data Unit
●
"Function
●
"MODBUS Parameters
●
Additional information on the MODBUS protocol can be obtained at
http://www.modbus.org. References are from MODBUS Application
Protocol Specification V1.1a MODBUS-IDA June 4, 2004.
Serial
The following are the communication parameters that are used to configure
the serial port of the iSeries to support MODBUS RTU protocol.
Number of Data bits
Number of Stop bits
Parity
Data rate
Parameters" on page
Parameters" on page
Definition" on page
Codes" on page C-3
Supported" on page
: 7 or 8
: 1 or 2
: None, Odd, or Even
: 1200 to 115200 Baud (9600 is default)
C-1
C-2
C-2
C-8
Model 48i Instruction Manual C-1