Panasonic FP0 - Page 208

General−use Serial Communications FP0
10 − 10
10.3 Operations When Using General−use Serial Communication
When sending data
b
a
b
a
<2> <1> <2> <1> <0>
b
a
<0>
b
a
<0>
d
e
c
<3>
STX
ETX
ETX STX
a
b
c d e
<0>
on
off
on
off
d
e
c
d
e
c
d
e
c
d
e
c
Transmission Transmission
F144 (TRNS) in-
struction execution
R9039
Transmission
completed flag
Send buffer
Number of bytes not yet sent
Duplex transmission
disabled while F144
(TRNS) instruction is
being executed
Transmitted data
Transmission point
Start codes (STX) and terminal codes (ETX) are automatically added to the data being
transmitted, and the data is transmitted to an external device. (For information on start
and terminal code settings, see section 10.2.)
Executing the F144 (TRNS) instruction turns off the transmission completed flag
(R9039).
Duplex transmission is disabled while the F144 (TRNS) instruction is being executed.
Check the transmission completed flag (R9039) to determine whether duplex
transmission is possible.