5-17
IM MW100-01E
Specification
5
Modbus Protocol Specifications
Common to Modbus Master Function and Modbus Slave Function
Communication possible in RTU mode of the Modbus protocol
Communication media: RS-232, RS-422A/485
Control method: No fl ow control (None only)
Baud rate: Select 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200
bps
Start bit: 1 bit, fi xed
Data length: 8 bit, fi xed
Parity: Select Odd, Even, or None
Stop bit: Select either 1 or 2 bits
Transmission mode: RTU (remote terminal unit) mode only
Slave address: 1 to 247 (slave address only)
Modbus Master Function (/M1 option)
Communication interval: The interval for data loading from other instruments is selected
from the following.
100, 200, 250, 500 ms, or 1, 2, 5, 10, 20, 30, 40, 50, 60, 90,
120 s
Timeout time: From the following, select a timeout time for no response from
the specifi ed slave after sending commands from the main unit.
100, 200, 250, 500 ms, or 1 s
Number of retries: The number of transmissions attempted if no response to
commands from the main unit are received from the slaves.
Select from the following: OFF, 1, 2, 3, 4, or 5
Communication recovery time:
You can select from the following the send interval for the
command sent after the point at which there is no
response from the slaves after sending commands the
specifi ed number of retry times.
1 to 120 s
Wait between commands: Select a time to wait between receiving of the response to
a command until the next command is sent.
Off, 0, 10, 20, 50, 100 ms
Supported functions: The functions that the MW100 supports are as follows.
Function Code Function Operation
3 Read hold registers MW100 loads data from the hold registers of
(4XXXX, 4XXXXX) another instrument to its communication input
channel data.
4 Read input registers MW100 writes data from the input register of
(3XXXX, 3XXXXX) another instrument to its communication input
channel data.
6 Simple write to hold MW100 writes to the hold register of
registers (4XXXX, another instrument.
4XXXXX)
16 Write to hold registers MW100 writes to the hold register of
(4XXXX ,4XXXXX) another instrument
Command settings: Up to 100 commands can be set.
5.2 Main Module Specifications
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