Hitachi SJ Series User Manual page 493

Chapter 14
14.2 Modbus-RTU
14.2.1 Communication specification
• Modbus-RTU is used as communication method.
Item
Transmission speed
Communication method Half duplex communication method
Synchronous mode
Transmission code
Transmission method
Applicable interface
Data bit length
Parity
Stop bit length
Start mode
Waiting time
Connection form
Error check
14.2.2 Wiring and Connection
Wiring location
Connect communication lines to the control circuit
terminal block.
Abbreviated
Terminal Name
SP Sending/receiving + side
SN Sending/receiving - side
RP Enable termination resistor
(SN) Enable termination resistor
(CM1)
Modbus-RTU Mode
2400/4800/9600/19.2k/38.4k/57.6k/76.8k/115.2k bps
Non-synchronous mode
Binary
Transmission from a low-order bit
RS-485
8 bits
No / Even / Odd
1/2 bits
Half side start mode by host side command
0~1000[ms]
1:N (N=Maximum 32)
Overrun / Framing / CRC-16 / Horizontal parity
Digital output
RS485 communication
FM CM1 SP SN
Description
terminal
terminal
Signal ground
Terminal for safety
monitoring
SP SN RP ED-
Control circuit terminal area
14-2
RS485 Communication
Remarks
Sets using a parameter.
Sets using a parameter.
Sets using a parameter.
Sets using a parameter.
Sets using a parameter.
ED+