2. SPECIFICATIONS
IMR01J08-E1
3
Modbus
Interface:
Based on RS-485, EIA standard
Connection method:
2-wire system, half-duplex multi-drop connection
Communication distance:
1 km max.
The maximum communication distance will be affected by the
surrounding conditions.
Synchronous method:
Start/stop synchronous type
Communication speed:
2400 bps, 4800 bps, 9600 bps, 19200 bps
Data bit configuration:
Data bit: 8 (Byte data corresponding to binary data or bit.)
Parity bit: Without, Odd or Even
Stop bit: 1
Protocol:
Modbus
Signal transmission mode:
Remote Terminal Unit (RTU) mode
Function code:
03H (Read holding registers)
06H (Preset single register)
08H (Diagnostics: loopback test)
Error check method:
CRC-16
Error code:
1: Function code error
2: When written to read only (RO) data, When any address other than
0000H to 001AH is specified, etc.
3: When the data written exceeds the setting range, When the specified
number of data items in the query message exceeds the maximum
number of data items available
4: Self-diagnostic error response
Termination resistor:
Externally
connected
Maximum connections:
32 instruments maximum including a master
Signal logic:
RS-485
Signal voltage
Logic
V (A) - V (B)
≥
2 V
0 (SPACE)
V (A) - V (B)
≤
-2 V
1 (MARK)
Voltage between V (A) and V (B) is the voltage of (A) terminal for the
(B) terminal.
