Panasonic FP0R User Manual page 143

Communication
7. F159_MTRN is executed at the same time the end code is received from the external
device. F159_MTRN turns the "reception done" flag to FALSE. Therefore, this flag will
not be detected.
NOTE
Resetting the receive buffer sets the number of bytes received in offset 0 to

0 and moves the write pointer back to offset 1. Subsequent data will be
stored in the receive buffer starting at offset 1.
 If two start codes are received from the external device, data following the
second start code overwrites the data in the receive buffer.
Sending data:
1
STX
2
3
a
b
4
5
<2> <1>
1 Data to be sent
2 "Transmission done" flag
3 F159_MTRN execution
When sending data, operation is as follows:
F159_MTRN is executed to send data to the external device. When F159_MTRN is executed:
1. The "transmission done" flag turns to FALSE.
2. The start code is sent automatically.
3. The number of bytes to be sent is set in offset 0 of the send buffer.
4. The characters a and b are sent to the external device.
- The end code is automatically added to the data sent.
- While F159_MTRN is being executed, no data can be received. (The
142
a
b
ETX
a a a
b b b
6
<0> <0>
4 Send buffer
5 Number of bytes to be sent
6 Write pointer
c d e
STX
c c c c
d d d d
e e e e
<3> <2> <1> <0>
ETX
TRUE
FALSE
TRUE
FALSE
c
d
e
<0>