FP2 Serial Data UnitConfirming the Unit Settings and Design Contents
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3.2 Setting the Transmission Speed and Transmission Format
Precautions concerning transmission format settings
The transmission format specified using the shared memory becomes effective
following a software reset.
The contents of the transmission format specified using the shared memory are cleared
if the power supply is interrupted, and the transmission speed and data length are set
to the values set with the transmission format setting switches. Other transmission
format values are set to the default values.
Transmission format settings should be written to the shared memory when execution
of the program begins.
Sample program
The “Control signals CS and CD” become valid as a result of the transmission format
settings entered at the factory.
In the example shown in the following program, the serial data unit is installed in slot
0.
Transmission format settings when the unit is shipped from the factory
Transmission speed 9600bps Control signals CS and CD Invalid...... ...
Data length 8 bits End code C
R
.............. ..................
Parity check odd Start code Invalid............. .................
Stop bit 1 bit.................
DF
, K0 , DT100 , K1 , K1003
R9014
F151 WRT
R9013
, H 19A , DT100
F0 MV
R9014 Y1D
S
DF
XE
Y1D
R
DF
Y1D
/
Specifies the FP2 serial data unit
in slot no. 0.
The 1−word data from data register DT100
is written to the shared memory address 1003.
The software reset is set (turned on) at the
next one scan.
The software reset is reset (turned off) when
the software reset completed flag goes on.
Reception processing should be started when
the software reset has been completed.
To send/receive
processing
“H019A” is written to DT100 at the
first one scan.
The data is written to the address
1003 area (the transmission format of
CH1) of the shared memory.
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