IDEC FT1A Series User Manual page 249

DTR Output Control Signal Option D8106
Special data register D8106 is used to control the DTR (data terminal ready) signal to indicate the SmartAXIS operating status or
transmitting/receiving status.
The DTR control signal option can be used only for the user communication through the RS232C port 2 to port 3.
The control status of each port is allocated as shown below:
Bit 15
D8106
D8106
2-bit Binary Value
00
01
10
11
While the SmartAXIS is running, DTR is on whether the SmartAXIS is transmitting or receiving data. While the
SmartAXIS is stopped, DTR remains off. Use this option to indicate the SmartAXIS operating status.
SmartAXIS
ON
DTR signal
OFF
Whether the SmartAXIS is running or stopped, DTR remains off.
SmartAXIS
ON
DTR signal
OFF
While the SmartAXIS can receive data, DTR is turned on. While the SmartAXIS can not receive data, DTR remains off.
Use this option when flow control of receive data is required.
Receive
ON
DTR signal
OFF
Same as D8106 = 00.
S AXIS P
MART
10: U
3 2 1 0
0 0 0 0
Port 3 Port 2
Description
Stopped
Stopped
Impossible
/L U ' M FT9Y-B1378
RO ITE SER S ANUAL
C
SER OMMUNICATION
Running Stopped
Running Stopped
Possible Impossible
I
NSTRUCTIONS
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