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6-3
6 No-protocol Mode
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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6-1-2 Specifications
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Send/Receive Message Frames for No-protocol Communications
6-1-2 Specifications
Item Description
Communications
mode Full-duplex
Messages (commu-
nications frame
structure) Set either of the following types in the Device Variable for CJ-series Unit for system set-
tings
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
Set in Device Variable for CJ-Series Unit for system settings
(With/without a start code, with/without an end code, setting 00 to FF hex for when using a
start code, setting 00 to FF hex for when using an end code, and set the number of receive
data bytes for when not using an 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 reception Set the number of receive data bytes between 1 and 256
bytes using Sysmac Studio or device variables 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
Send delay time When the SerialSend instruction is executed and the send delay time elapses, the data is
sent from the port.
0 to 300 s (0 to 300,000 ms)
(Setting in increments of 10 ms. Set with *_P1_SendDelayCfg and *_ P2_SendDelayCfg
(Send Delay Settings).)
Receive counter Counts the number of data bytes (0 to 256) received at the port.
Reception buffer
clear timing SerialRcv instruction: After reading the receive data
SerialRcvNoClear instruction: When the receive data size variable (Size) is set to 0
Start
Code
End code
No Yes CR+LF
No
Yes
Data
256 bytes max.
Data
256 bytes max.
Data
256 bytes max.
Data
256 bytes max.
Data
256 bytes max.
Data
256 bytes max.