Modbus Communications Set Up Group; Table 4-12 Modbus Communications Group Definitions - Honeywell DR4500A Product Manual

4.12 Modbus Communications Set Up Group

Introduction
This option allows the DR4500A to be connected to a host computer via the Modbus protocol. Up to 99
addresses and a maximum of 15 units can be configured over this link.
REFERENCE
Refer to Documents 51-52-25-66 and 51-52-25-69 for a complete description of the RS485
Modbus Communications Option.
Communications group prompts
Table 4-12 lists all the function prompts in the Modbus Communications set up group and their functions.
Lower Display
Prompt Range of Setting or Selection
ComSTATE
DISABL
MODBUS
Com ADDR 1 to 99
BAUD
300
600
1200
2400
4800
9600
19200
38400
XMT DLAY
NONE
10MSEC
20MSEC
30MSEC
40MSEC
50MSEC
DBL BYTE
FP B
FP BB
FP L
FP LB
Release M DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual
April 2017

Table 4-12 Modbus communications group definitions

Upper Display
Configuration Parameter Definitions
Modbus Communications Set Up Group
Parameter Definition
DISABL—Disables the communications option.
MODBUS—Allows Modbus communication prompts.
COMMUNICATIONS STATION ADDRESS — This is a
number that is assigned to the recorder that is to be
used with the communications option.
BAUD RATE is the transmission speed in bits per
second.
300 Baud
600 Baud
1200 Baud
2400 Baud
4800 Baud
9600 Baud
19200 Baud
38400 Baud
TRANSMIT DELAY—This is the approximate time
delay between receipt of Modbus request message and
start of response message (in addition to message
processing time).
DOUBLE REGISTER BYTE ORDER—The transmitted
or received order of the 4 bytes comprising an IEEE
floating point value. The default order is EXP, MH, MM,
ML, or 0123 for reference.
0123 (Big Endian)
1032 (Big Endian, Byte Swapped)
3210 (Little Endian)
2301 (Little Endian, Byte Swapped)
111