Instruction Manual

3-1
IM 04L31A01-17E
Serial Interface
3
3.1 Serial Interface Specifications
The specifications of the two types of serial interfaces (options), RS-232 and RS-422/
485, of the CX are given below.
RS-232 Specifications
Connector type D-Sub 9-pin plug
Electrical and mechanical specifications Conforms to EIA-574 (9-pin EIA-232 (RS-232))
Connection Point-to-point
Transmission mode Half-duplex
Synchronization Start-stop synchronization
Baud rate Select from 1200, 2400, 4800, 9600, 19200, and 38400
[bps].
Start bit Fixed to 1 bit
Data length Select 7 or 8 bits
To output data in BINARY format, make sure to set the data length to 8 bits.)
Parity Select Odd, Even, or None (no parity).
Stop bit Fixed to 1 bit
Hardware handshaking Select whether to set the RS and CS signals to TRUE
always or use them as control lines.
Software handshaking Select whether to use the X-ON and X-OFF signals to
control the transmission data or both transmission and
reception data.
X-ON (ASCII 11H) and X-OFF (ASCII 13H)
Received buffer length 2047 bytes
RS-422/485 Specifications
Terminal block type Number of terminals: 6, terminal attachment screws:
ISO M4/nominal length of 6 mm
Electrical and mechanical specifications Conforms to EIA-422 (RS-422) and EIA-485 (RS-485)
Connection Multidrop For a four-wire system 1:32
For a two-wire system 1:31
Transmission mode Half-duplex
Synchronization Start-stop synchronization
Baud rate Select from 1200, 2400, 4800, 9600, 19200, and 38400
[bps].
Start bit Fixed to 1 bit
Data length Select 7 or 8 bits
Parity Select Odd, Even, or None (no parity).
Stop bit Fixed to 1 bit
Received buffer length 2047 bytes
Escape sequence Open and close
Electrical characteristics 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 CX are functionally isolated.
The FG terminal is the frame ground.
Communication distance Up to 1.2 km
Terminator External: Recommended resistance is 120 Ω , 1/2 W
Chapter 3 Serial Interface