Modbus Protocol; General Descriptions; Transmission Setting - M-system 47D Series Reference Manual

2.

MODBUS PROTOCOL

2.1

GENERAL DESCRIPTIONS

The 47D Series Digital Panel Meter (referred hereunder as 'the device') is applicable with Modbus RTU mode. ASCII
mode is not usable.
Detailed information about Modbus Protocol is described in MODBUS APPLICATION PROTOCOL V1.1a / Modbus
over Serial Line Specification & Implementation Guide V1.0, provided at Modbus-IDA (http://www.modbus.org/).
2.2

TRANSMISSION SETTING

Device address, baud rate, parity check type and other properties are selectable via the control buttons at the front
of the device. It is also possible to change these settings via Modbus communication.
COMM. PROPERTY
Modbus address
Baud rate
Parity bit
Stop bit
T1.5 timer length
T3.5 timer length
Long register
(32-bit words assignments) Swap : High-digit word at lower address
(*) Factory setting
The following parameters are fixed.
COMM. PROPERTY
Data bit
Flow control
SELECTION
1 to 247
Factory setting : 1
1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
38400 bps (*)
None
Odd (*)
Even
1 bit (*)
2 bits
0.1 to 6.0, in 0.1 increments (Modbus protocol standard: 1.5)
Factory setting : 1.5
0.1 to 6.0, in 0.1 increments (Modbus protocol standard: 3.5)
Factory setting : 3.5
Normal : Low-digit word at lower address (*)
SELECTION
8 bits
No
47D Series Modbus Reference Guide EM-9501-C Rev.4
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