Rosemount 3095FB - GENERAL PROTOCOL INFORMATION; Supported Protocols; Physical Layer Requirements; Data Format

Reference Manual
00809-0100-4738, Rev DA
May 2006
Rosemount 3095FB
www.rosemount.com
Appendix C 3095FB Modbus Integration
Guide
Use this appendix for quick reference to common parameters needed to
integrate the 3095FB with various RTUs and other Modbus hosts. For more
detailed information, please refer to the Modbus Protocol Guide located in
chapter 3 of this manual.
GENERAL PROTOCOL
INFORMATION
Supported Protocols
The 3095FB supports the following types of Modbus:
• Standard Modbus – RTU
Physical Layer Requirements
• RS485
•2-Wire (A & B)
• Half-Duplex
Data Format
• Data Bits: 8
• Stop Bits: 1
• Parity: None
• Bit Order: Least Significant Byte (LSB)
Baud Rate
The baud rate is selectable by using the jumper located on the comm.
electronics board of the transmitter (see section 2-12 of this manual).
• Default Baud Rate: 9600
• Available Baud Rates: 1200, 2400, 4800, 9600
Supported Modbus Function Codes
Table C-1 lists all of the Modbus functions supported by the 3095FB. For
more information, please refer to page 13 of the Modbus Protocol Guide in
chapter 3 of this manual.
TABLE C-1. Supported Modbus Commands
Function Code Description
01 Read coil status
02 Read input status
03 Read holding registers
04 Read input registers
05 Force coil
06 Write register
08 Loopback diagnostic
16 Write multiple registers
69 Read multiple floating point registers
70 Write mulitipe floating point registers