FC6A S
ERIES
M
ICRO
S
MART
A
LL
-
IN
-O
NE
T
YPE
C
OMMUNICATION
M
ANUAL
FC9Y-B1730
5-33
5: U
SER
C
OMMUNICATION
I
NSTRUCTIONS
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
0
2
0
1
0
0
D8105
0
3
0
5
0
4
Port 3
Port 2
Port 1
6
8
7
0
0
0
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 FC6A Series MicroSmart can transmit and receive data.
010
When DSR is off, the FC6A Series MicroSmart can transmit and receive data.
011
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.
100
When DSR is off, the FC6A Series MicroSmart 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