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Serial 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 Sampler enables
the user to perform the functions such as reading the various measurements
and other analog values or variables, reading the status of the digital
outputs, and to triggering or simulating the activation of a digital input to
the Sampler. This is achieved by using the following supported MODBUS
commands.
For details of the Partisol 2025i and 2025i-D MODBUS Protocol
specification, see the following topics:
"Serial Communication
●
"TCP Communication
●
"Application Data Unit
●
"Function
Codes" on page
●
"MODBUS Addresses
●
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.
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 : 7 or 8
Number of Stop bits : 1 or 2
Parity
Data rate
Parameters" on page
Parameters" on page
Definition" on page
C-3
Supported" on page
: None, Odd, or Even
: 1200 to 115200 Baud (9600 is default)
Partisol 2025i and Partisol 2025i-D Instruction Manual
C-1
C-2
C-2
C-8
C-1
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