2-371

2 Instructions
CP1E CPU Unit Instructions Reference Manual(W483)

Serial Communication

Instructions
2

TXD

•Up to 259 bytes can be sent, including the send data (N = 256 bytes max.), the start code, and the

end code.

•Specify the size of the send data, not including the start code and end code, in N.

Start code / end code settings and send data
Hint

•When sending data to another device by TXD instruction, the device may require that the data be

sent at certain intervals. In that case, a transmission delay time can be set to adjust the transmission

intervals.

Precautions

•TXD(236) can be used only for the CPU Unit’s RS-232C port or the Serial Option Board port. In addi-

tion, the port must be set to no-protocol mode.

•Data can be sent only when the port’s Send Ready Flag is ON. (The Send Ready Flag is A392.05 for

the CPU Unit’s RS-232C port, or A392.13 for Serial Option Board port.)

•Nothing will be sent if 0 is specified for N.

ED
...
...
ST
... ED
...
ST
LF
... CR
...
ST CR LF
CR+LF End Code
Only End Code
No Start or End Code
N send bytes: 256 max.
Only Start Code
Send bytes after ST:
256 max.
Send bytes before ED:
256 max.
Start and End Code
Send bytes between
ST and ED: 256 max.
Send bytes before
CR+LF: 256 max.
Send bytes between ST
and CR+LF: 256 max.
Start and CR+LF End Code
Data sent.
S
S+1
S+2
15 7 08
N bytes of data is sent in the following order when sending
the most significant bytes first is specified:
,,,,,
CPU Unit’s built-in RS-232C port or Serial Option
Board port