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1-15
1 Introduction
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
1-6 Sp
ecific
a
tion
s
1
1
-6-2
Gene
ral Specifications
The general specifications of the Serial Communications Units conform to those of the NJ-series CPU
Unit.
z
Protocol Macro Function Specifications
1-6-2 General Specifications
Item Description
Number of protocols 20 max. Can be created and registered with the Protocol Support Tool
(CX-Protocol).
Number of sequences 1,000 max.
Per protocol Number of
sequences 60 max.
Number of mes-
sages 300 max.
Number of receive
matrixes 100 max.
Sequence execution condition Using the CPU Unit's ExecPMCR instruction (specifying the sequence
number)
Communications mode Half-duplex or full-duplex
Synchronous mode Start-stop synchronization (asynchronous mode)
Baud rate (*1) RS-232C port and RS-422A/485 ports:
1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/230,400 bps
Default setting: 9,600 bps
Communications distance (*1) RS-232C port: 15 m max.
RS-422A/485 port:
1,200 m max. (total cable length: 1,200 m max., Multidrop connections are
possible. However, maximum cable length is 500 m if the NT-AL001 is
used for RS-422A-485 connections.)
Connection configuration RS-232C port: 1:1 (1:N (N = 32 units max.) is possible using a Converting
Link Adapter.)
RS-422A/485 port: 1:N (N = 32 units max.)
Maximum number of
data exchange words
between PLC and proto-
col macro function Operand setting 250 words Including the word that specifies the number of
words (1 word)
Link word setting 500 words O1, O2, I1, and I2: 500 words total
Direct setting 500 words Maximum number of words per data attribute
Sequence contents (step
common parameters) Number of steps
per sequence 16 max.
Transmission con-
trol parameters (*2) X-on/X-off flow, RS/CS flow, delimiter control, contention control or
modem control.
Response notifica-
tion method (oper-
and) (Writes the receive data in the memory area used for CJ-series Units
specified in DstDat of the ExecPMCR instruction)
Writes the receive data to memory used for CJ-series Units during CPU
Unit I/O refresh.
Monitoring time
during send/receive
processing Receive wait, receive completion, or send completion can be monitored.
Setting range: 0.01 to 0.99 s, 0.1 to 9.9 s, 1 to 99 s, or 1 to 99 minutes
Link word setting Area in which data is exchanged between the CPU Unit and the Serial
Communications Unit during Communications Unit refreshing. Two areas
can be specified for each device: One for storing received data and the
other for storing sent data.