IDEC FT1A Series User Manual page 248

10: U C
SER OMMUNICATION
DSR Input Control Signal Option D8105
Special data register D8105 is used to control data flow between the SmartAXIS RS232C port 2 through port 3 and the remote
terminal depending on the DSR (data set ready) signal sent from the remote terminal. The DSR signal is an input to the SmartAXIS
to determine the status of the remote terminal. The remote terminal informs the SmartAXIS using DSR whether the remote
terminal is ready for receiving data or is sending valid data.
The DSR 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
D8105
D8105
3-bit Binary Value
000
001
010
011
100
≥ 101
10-12
I
NSTRUCTIONS
DSR is not used for data flow control. When DSR control is not needed, set 0 to D8105.
When DSR is on, the SmartAXIS can transmit and receive data.
ON
DSR signal
OFF
Transmit/receive
When DSR is off, the SmartAXIS can transmit and receive data.
ON
DSR signal
OFF
Transmit/receive
When DSR is on, the SmartAXIS can transmit data. This function is usually called "Busy Control" and is used for
controlling transmission to a remote terminal with a slow processing speed, such as a printer. When the remote
terminal is busy, data input to the remote terminal is restricted.
ON
DSR signal
OFF
Transmit
When DSR is off, the SmartAXIS can transmit data.
ON
DSR signal
OFF
Transmit
Same as D8105 = 000. DSR is not used for data flow control.
S AXIS P
MART
5 4 3 2 1 0
0 0 0 0 0 0
Port 3 Port 2
Description
Impossible
Impossible
Impossible
Impossible
/L U ' M FT9Y-B1378
RO ITE SER S ANUAL
Possible Impossible
Impossible
Possible
Possible Impossible
Impossible
Possible