D-1
Scanner
®
2000 microEFM
Appendix D
Appendix D—Modbus
®
Communications Protocol
Firmware Version: 4.10
Register Table Version: 15
Introduction
The communications protocol for the Scanner 2000 is in accordance with Modicon, Inc. RTU Mode
Modbus® as described in
Modicon Modbus Protocol Reference Guide
, PI-MBUS-300 Rev. J, June 1996. All
registers are implemented as 4X or holding registers. Reading of registers is implemented via function code
03H (Read Holding Registers). Writing to registers is implemented via function code 10H (Preset Multiple
Registers). The instrument provides Enron Modbus® compliant downloads for interval, daily and event
records. For details on Enron Modbus®, refer to
Specifications and Requirements for an Electronic Flow
Measurement Remote Terminal Unit for Enron Corp
., Dec. 5, 1994.
Supported Commands
The Modbus® functions supported by the Scanner 2000 are as follows:
Function Code (Hex)
Description
03
Read Holding Registers
05
Preset Boolean
(for Enron event record acknowledgement)
10
Preset Multiple Registers
11
Report Slave ID
For the read holding and preset multiple registers, the instrument supports the full 250 bytes of data in a
message. This corresponds to 125 registers in 16-bit holding register size and 62 registers in 32-bit holding
register size.
The report slave ID function code returns the following registers:
•
Product Code
•
Register Table Number
•
Firmware Version
•
Manufacture Date
•
Sales Date
• Serial Number 1
•
Serial Number 2
•
Power Mode
• Connected Port (0 = connected to Port 1; 1 = connected to Port 2)
•
Port Mode
•
Port SlaveAddress
• Port BaudRate
Summary of Contents for Scanner 2000 microEFM
Page 1: ...NUFLO Scanner 2000 microEFM Hardware User Manual Manual No 9A 30165023 Rev 10 ...
Page 26: ...26 Section 1 Scanner 2000 microEFM ...
Page 104: ...A 18 Appendix A Scanner 2000 microEFM ...
Page 106: ...B 2 Appendix B Scanner 2000 microEFM ...
