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47D Series Modbus Reference Guide EM-9501-C Rev.4
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
SELECTION
Modbus address
1 to 247
Factory setting : 1
Baud rate
1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
38400 bps (*)
Parity bit
None
Odd (*)
Even
Stop bit
1 bit (*)
2 bits
T1.5 timer length
0.1 to 6.0, in 0.1 increments (Modbus protocol standard: 1.5)
Factory setting : 1.5
T3.5 timer length
0.1 to 6.0, in 0.1 increments (Modbus protocol standard: 3.5)
Factory setting : 3.5
Long register
Normal : Low-digit word at lower address (*)
(32-bit words assignments) Swap : High-digit word at lower address
(*) Factory setting
The following parameters are fixed.
COMM. PROPERTY
SELECTION
Data bit
8 bits
Flow control
No
