Omron CJ1W-SCU22, Руководство по эксплуатации, Страница: 60 / 478

1 Introduction
1-20
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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No-protocol Specifications
* The baud rate and the communications distance sometimes depend on the remote device.
Item Description
Communications
mode Full-duplex
Baud rate (*) 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 (*) 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. How-
ever, maximum cable length is 500 m if the NT-AL001 is used for RS-422A-485 connec-
tions.)
Messages (commu-
nications frame
structure) Set either of the following six types in the Sysmac Studio or device variable for CJ-series
Unit.
1. Data only (without start code or end code)
2. Start code + data
3. Data + end code
4. Start code + data + end code
5. Data + CR + LF
6. Start code + data +CR + LF
You can make the following setting with the Sysmac Studio or device variable for CJ-series
Unit:
Select to have the start code or not,
select to have the end code or not,
select the start code from 00 to FF hex when you set to have one,
select the end code from 00 to FF hex when you set to have one, and
set the number of receive data bytes when you set not to have the end code.
Start code None or 00 to FF hex
End code None, 00 to FF hex, or CR + LF
Number of receive data bytes during recep-
tion Set the number of receive data bytes
between 1 and 256 bytes (according to the
settings in Sysmac Studio or device variable
for CJ-series Unit.) when frame structure 1
or 2 above is used.
Sending messages SerialSend instruction
Receiving mes-
sages SerialRcv or SerialRcvNoClear instruction
Maximum message
length Sending and receiving: Up to 259 bytes including the start code and end code (up to 256
bytes excluding start/end codes)
Data conversion No conversion
Communications
protocol None
Message delay time When the SerialSend instruction is executed, after the send delay time, the data is sent
from the port.
0 to 300 s (0 to 300,000 ms)
(Can be set in 10-ms units: Set in System Studio or by using a device variable for CJ-series
Unit.)
Receive counter The number of data bytes (0 to 256) received at the port can be counted.
Reception buffer
clear timing SerialRcv instruction: After reading the receive data
SerialRcvNoClear instruction: When the receive data size variable (Size) is set to 0