Software User Manual FRN 1.2 Owner manual

Publication 1758-UM002D-EN-P - October 2010

Enron Modbus Protocol for the 1758-FLO DataSite Controller 325

Information Variables

This section describes global variables used in the DataSite controller. These

variables contain the information about the controller and can be accessed by

using the Enron Modbus protocol.

Short Integer Variables

Short integer variables are accessed using commands 3, 6, and 16. These

commands are similar to the corresponding standard Modbus commands, and

they use Enron Modbus addressing. The size of the data fields for each

variable is determined by the variable address. The read command returns two

bytes for each requested register. The write command provides two bytes for

each register value. Read-only (RO) registers cannot be written by using

commands 6 and 16.

The following tables list all the short integer variables used by Enron Modbus

in the DataSite controller. The Access column in the tables indicates the

Configuration registers are read/write registers.

Firmware and hardware version information

3001 Firmware version high bytes

(ASCII code range 0x30…0x39 and 0x3E)

3002 Firmware version low bytes

(ASCII code range 0x30…0x39 and 0x3E)

3003 Hardware version high bytes

(ASCII code range 0x30…0x39 and 0x3E)

3004 Hardware version low bytes

(ASCII code range 0x30…0x39 and 0x3E)

Real-time clock variables

3005 Year. Range: 0…99 R/W

3006 Month. Range: 1…12 R/W

3007 Day. Range: 1…31 R/W

3008 Hour. Range: 0…23 R/W

3009 Minute. Range: 0…59 R/W

3010 Second. Range: 0…59 R/W