NAiS FP Series User Manual page 188

FPΣ
Sample program
In the following example, the Micro - Imagechecker is connected to the COM. 1 port.
R0
DF
R10
F95 ASC ,
F159 MTRN , DT 100
With DT100 as the transmission buffer
the contents consisting of two bytes of it
R9038
DF
R11
F10 BKMV
The 4- word contents from DT201 to DT204
are written to data registers DT0 to DT3.
R11
F159 MTRN
Starting from DT100
Figure 185: FPΣ Sample program (for micro - imagechecker)
The various buffer statuses
The following shows the statuses of the send and received buffers when the sample
program is run.
Transmission buffer
DT100 K2
DT101
H53 (S) H25 (%)
(Statuses before
transmission)
Figure 186: FPΣ Various buffer statuses
M %S , DT101
Ten spaces inserted
, K2 , K1
are sent from COM. 1 (K1) port.
, D201 , DT204 , DT0
, DT 100 , K0 , K1
the contents of 0 bytes
are sent from the COM. 1 (K1) port.
Number of
DT200
bytes to be
DT201
transmitted
DT202
DT203
DT204
9.3 Connection Example with External Devices
R10
Data transmission command
The internal relay "R10" is turned on at the
timing of the transmission condition "R0".
Data conversion
The start command "%S" character is con-
verted to ASCII code, and written to DT101 to
DT106.
Data transmission
The data in the transmission buffer is sent
from the COM. 1 port
R11
Reception done detection
The internal relay "R11" is turned on at the
reception done contact "R9038" timing.
Retrieving received data
The received data in the received buffer is
read from the area in which it is stored (from
DT201) and sent to DT0.
Preparing to receive the next data
To prepare to receive the next data, the F159
instruction resets the buffer writing point and
turns off the reception done contact "R9038",
based on the empty data.
Reception buffer
K7
H30 (0) H31 (1)
H32 (2) H31 (1)
H34 (4) H33 (3)
H35 (5)
(Statuses when
reception is completed)
Received
number of
bytes
Received data is
stored in order from
the lower - order byte.
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