IDEC FC4A-C24R2 User Manual

17: USER COMMUNICATION INSTRUCTIONS
« FC4A MICROSMART USER’S MANUAL » 17-29
RS232C Line Control Signals
While the MicroSmart is in the user communication mode, special data registers can be used to enable or disable DSR and
DTR control signal options for port 2. Port 2 is available on the 16- and 24-I/O type CPU modules only, and an optional
RS232C adapter must be installed on the port 2 connector to enable the RS232C communication. The DSR and DTR con-
trol signal options cannot be used for port 1.
The RTS signal line of port 2 remains on.
Special Data Registers for Port 2 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 2. 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
RS232C Port DR No. Data Register Function DR Value Updated R/W
Port 2
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
D8104 Value DTR DSR Description
0 OFF OFF Both DSR and DTR are off
1 OFF ON DSR is on
2 ON OFF DTR is on
3 ON ON Both DSR and DTR are on
Communication
Mode
D8105 Value
DSR (Input) Status
RUN Mode STOP Mode
User
Communication
Mode
0 (default) No effect No effect (TXD/RXD disabled)
1
ON: Enable TXD/RXD
OFF: Disable TXD/RXD
No effect (TXD/RXD disabled)
2
ON: Disable TXD/RXD
OFF: Enable TXD/RXD
No effect (TXD/RXD disabled)
3
ON: Enable TXD
OFF: Disable TXD
No effect (TXD/RXD disabled)
4
ON: Disable TXD
OFF: Enable TXD
No effect (TXD/RXD disabled)
5 or more No effect No effect (TXD/RXD disabled)
Maintenance Mode — No effect No effect
Communication
Mode
D8106 Value
DTR (Output) Status
RUN Mode STOP Mode
User
Communication
Mode
0 (default) ON OFF
1 OFF OFF
2
RXD enabled: ON
RXD disabled: OFF
OFF
3 or more ON OFF
Maintenance Mode —ON ON

IDEC FC4A-C24R2 Specifications

General

Brand	IDEC
Model	FC4A-C24R2
Category	Controller
Language	English