IDEC FC6A-C16K1CE Communications Manual page 109

DSR Input Control Signal Option D8105
Special data register D8105 is used to control data flow between the FC6A Series MicroSmart RS232C port 1 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
FC6A Series MicroSmart to determine the status of the remote terminal. The remote terminal informs the FC6A Series MicroSmart
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 1 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
8
0
Port 3
DSR is not used for data flow control. When DSR control is not needed, set 0 to D8105.
When DSR is on, the FC6A Series MicroSmart can transmit and receive data.
ON
DSR signal
OFF
Transmit/receive
When DSR is off, the FC6A Series MicroSmart can transmit and receive data.
ON
DSR signal
OFF
Transmit/receive
When DSR is on, the FC6A Series MicroSmart 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 FC6A Series MicroSmart can transmit data.
ON
DSR signal
OFF
Transmit
Same as D8105 = 000. DSR is not used for data flow control.
FC6A S M S A
ERIES ICRO MART
7 6 5 4 3 2 1
0 0 0 0 0 0 0
Port 2 Port 1
Description
Impossible
Impossible
Impossible
Impossible
- -O T C
LL IN NE YPE OMMUNICATION
5: U C
SER OMMUNICATION
0
0
Possible Impossible
Impossible
Possible
Possible Impossible
Impossible
Possible
M FC9Y-B1730
ANUAL
I
NSTRUCTIONS
5-33