Chapter 3 Using The Rs-422A/485 Communication Interface (/C3 Option); Rs-422A/485 Communication Interface Specifications; The Rs-422A/485 Communication Interface - YOKOGAWA Vigilantplant mR10000 User Manual

Chapter 3 Using the RS-422A/485 Communication Interface (/C3 Option)

3.1 RS-422A/485 Communication Interface
Specifications
IM 04P01B01-17E
This section describes the RS-422A/485 communication interface specifications.
Item
Terminal block type
Electrical and mechanical
specifications
Connection
Transmission mode
Synchronization
Baud rate
Start bit
Data length
Parity
Stop bit
Received buffer length
Escape sequence
Electrical characteristics
Communication distance
Terminal resistance
Specifications
Number of terminals: 6, terminal attachment screws: ISO
M4/nominal length of 6 mm
Complies with the EIA-422A(RS-422A) and
EIA-485(RS-485) standards
Multidrop Four-wire system 1:32
Two-wire system 1:31 (Modbus slave protocol)
Half-duplex
Start-stop synchronization
Select from 1200, 2400, 4800, 9600, 19200, and 38400 [bps].
Fixed to 1 bit
Select 7 or 8 bits
Select Odd, Even, or None (no parity).
Fixed to 1 bit
2047 bytes
Open and close
6 points consisting of FG, SG, SDB, SDA, RDB, and RDA
The SG, SDB, SDA, RDB, and RDA terminals and the
internal circuitry of the recorder are functionally isolated.
The FG terminal is the frame ground.
Up to 1.2 km
120 Ω, 1/2 W
3
3-1