IDEC SmartAXIS FT9Z-1A01, User Manual

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10: U
SER
C
OMMUNICATION
I
NSTRUCTIONS
10-12 S
MART
AXIS P
RO
/ L
ITE
U
SER
'
S
M
ANUAL
FT9Y-B1378
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
0
2
0
1
0
0
D8105 0
3
Port 2
0
5
0
4
Port 3
D8105
3-bit Binary Value
Description
000 DSR is not used for data flow control. When DSR control is not needed, set 0 to D8105.
001
When DSR is on, the SmartAXIS can transmit and receive data.
010
When DSR is off, the SmartAXIS can transmit and receive data.
011
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.
100
When DSR is off, the SmartAXIS can transmit data.

101 Same as D8105 = 000. DSR is not used for data flow control.
DSR signal
ON
OFF
Possible
Impossible Impossible
Transmit/receive
DSR signal
ON
OFF
Possible Impossible Impossible Transmit/receive
DSR signal
ON
OFF
Possible Impossible Impossible
Transmit
DSR signal
ON
OFF
Possible Impossible Impossible
Transmit