Rs232C Line Control Signals - IDEC SmartAXIS FT9Z-1A01 User Manual

RS232C Line Control Signals

While the SmartAXIS is in user communication mode, special data registers can be used to enable or disable DSR and DTR control
signal options for port 2 through port 3. The DSR and DTR control signal options cannot be used for port 1.
The RTS signal line of port 2 through port 3 remains on.
In the maintenance communication mode, DSR has no effect and DTR remains on.
Special Data Registers for Port 2 to Port 3 RS232C Line Control Signals
Special data registers D8104 through D8106 are allocated for RS232C line control signals.
Communication
Port
Port 2 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 2 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
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
—
S A XI S P
M AR T
10 : U
Every scan
When sending/receiving data
When sending/receiving data
3 2 1 0
0 0 0 0
Port 3 Port 2
DTR DSR
OFF OFF
OFF
ON OFF
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
/ L U ' M FT9Y-B 1378
R O I TE SER S ANUAL
C
SER OM M UN I CATI ON
Data Register Value Updated
Description
Both DSR and DTR are off
ON DSR is on
DTR is on
ON Both DSR and DTR are on
DSR (Input) Status
STOP Mode
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
STOP Mode
OFF
OFF
OFF
OFF
ON
I
N STR UCTI ON S
R/W
R
R/W
R/W
10-11