A-101
Appendices
CJ2 CPU Unit Hardware User’s Manual
A-4 Connecting to the RS-232C Serial Port on the CPU Unit
App
A-4-1 RS-232C Port Specifications
A-4 Connecting to the RS-232C Serial
Port on the CPU Unit
This appendix provides connection diagrams and wiring methods for making an RS-232C cable to con-
nect to the serial port on the CPU Unit.
Precautions for Correct UsePrecautions for Correct Use
Do not use the 5-V power from pin 6 of the RS-232C port on the CPU Unit for anything but the
NT-AL001-E Link Adapter. The external device or the CPU Unit may be damaged.
*1 Baud rates for the RS-232C are specified only up to 19.2 kbps. The CJ Series supports serial communications
from 38.4 kbps to 115.2 kbps, but some computers cannot support these speeds. Lower the baud rate if nec-
essary.
A-4-1 RS-232C Port Specifications
Connector Pin Arrangement
Pin No. Signal Name Direction
1 FG Protection earth ---
2 SD (TXD) Send data Output
3 RD (RXD) Receive data Input
4 RS (RTS) Request to send Output
5 CS (CTS) Clear to send Input
6 5 V Power supply ---
7 DR (DSR) Data set ready Input
8 ER (DTR) Data terminal ready Output
9 SG (0 V) Signal ground ---
Connector hood FG Protection earth ---
Communications Specifications
Item Specification
Communications method Half duplex
Synchronization Start-stop
Baud rate
0.3/0.6/1.2/2.4/4.8/9.6/19.2/38.4/57.6/115.2 kbps
*1
Transmission distance 15 m max.
Interface EIA RS-232C
Protocol Host Link, NT Link, 1:N, No-protocol, or Peripheral Bus
5
1
9
6
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