IDEC FC6A-C16K1CE Communications Manual page 108

5: U C
SER OMMUNICATION
RS232C Line Control Signals
While the FC6A Series MicroSmart is in user communication mode, special data registers can be used to enable or disable DSR and
DTR control signal options for port 1 through port 3.
Line control signals cannot be used with RS485 communication.
The RS-232C communication cartridge (FC6A-PC1) RS signal is an always on output signal.
In the maintenance communication mode, DSR has no effect and DTR remains on.
Special Data Registers for Port 1 to Port 3 RS232C Line Control Signals
Special data registers D8104 through D8106 are allocated for RS232C line control signals.
Communication
Port
Port 1 to Port 3
Control Signal Status D8104
Special data register D8104 stores a value to show that DSR and DTR are on or off at port 1 through port 3.
The data of D8104 is updated at every END processing.
Bit 15
D8104
D8104 2-bit Binary Value
00
01
10
11
DSR Control Signal Status in RUN and STOP Modes
Communication
Mode
User
Communication
Mode
Maintenance Mode
DTR Control Signal Status in RUN and STOP Modes
Communication
Mode
User
Communication
Mode
Maintenance Mode
5-32
I
NSTRUCTIONS
DR No. Data Register Function
D8104 Control signal status
D8105 DSR input control signal option
D8106 DTR output control signal option
D8105
3-bit Binary Value
000 (default)
001
010
011
100
≥ 101
—
D8106
2-bit Binary Value
00 (default)
01
10
11
—
FC6A S M S A
ERIES ICRO MART
Every scan
When sending/receiving data
When sending/receiving data
5 4 3 2 1 0
0 0 0 0 0 0
Port 3 Port 2 Port 1
DTR
OFF
OFF
ON
ON
RUN Mode
No effect
ON: Enable TXD/RXD
OFF: Disable TXD/RXD
ON: Disable TXD/RXD
OFF: Enable TXD/RXD
ON: Enable TXD
OFF: Disable TXD
ON: Disable TXD
OFF: Enable TXD
No effect
No effect
RUN Mode
ON
OFF
RXD enabled: ON
RXD disabled: OFF
ON
ON
- -O T C
LL IN NE YPE OMMUNICATION
Data Register Value Updated
DSR
OFF Both DSR and DTR are off
ON DSR is on
OFF DTR is on
ON Both DSR and DTR are on
DSR (Input) Status
No effect (TXD/RXD disabled)
No effect (TXD/RXD disabled)
No effect (TXD/RXD disabled)
No effect (TXD/RXD disabled)
No effect (TXD/RXD disabled)
No effect (TXD/RXD disabled)
No effect
DTR (Output) Status
OFF
OFF
OFF
OFF
ON
M FC9Y-B1730
ANUAL
R/W
R
R/W
R/W
Description
STOP Mode
STOP Mode