IDEC MICROSmart FC6A-C16K1CE, Руководство по связи, Страница: 108 / 252

5: U
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NSTRUCTIONS
5-32 FC6A S
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ANUAL
FC9Y-B1730
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.
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.
DSR Control Signal Status in RUN and STOP Modes
DTR Control Signal Status in RUN and STOP Modes
Communication
Port
DR No. Data Register Function Data Register Value Updated R/W
Port 1 to Port 3
D8104 Control signal status Every scan R
D8105 DSR input control signal option When sending/receiving data R/W
D8106 DTR output control signal option When sending/receiving data R/W
Bit 15
0
2
0
1
0
0
D8104 0
3
Port 1 Port 2
0
4
0
5
Port 3
D8104 2-bit Binary Value DTR DSR Description
00 OFF OFF Both DSR and DTR are off
01 OFF ON DSR is on
10 ON OFF DTR is on
11 ON ON Both DSR and DTR are on
Communication
Mode
D8105
3-bit Binary Value
DSR (Input) Status
RUN Mode STOP Mode
User
Communication
Mode
000 (default) No effect No effect (TXD/RXD disabled)
001
ON:
OFF: Enable TXD/RXD
Disable TXD/RXD
No effect (TXD/RXD disabled)
010
ON:
OFF: Disable TXD/RXD
Enable TXD/RXD
No effect (TXD/RXD disabled)
011
ON:
OFF: Enable TXD
Disable TXD
No effect (TXD/RXD disabled)
100
ON:
OFF: Disable TXD
Enable TXD
No effect (TXD/RXD disabled)
≥ 101 No effect No effect (TXD/RXD disabled)
Maintenance Mode — No effect No effect
Communication
Mode
D8106
2-bit Binary Value
DTR (Output) Status
RUN Mode STOP Mode
User
Communication
Mode
00 (default) ON OFF
01 OFF OFF
10
RXD enabled:
RXD disabled: ON
OFF
OFF
11 ON OFF
Maintenance Mode — ON ON