Panasonic FP2 User Manual page 16

Flow Control
Connections when using flow control (RS and ER control used)
As when no flow control is being used, connections are made with the SD (Sent Data)
and RD (Received Data) of the two devices crossed, but in addition, the signal lines of
the RS (Request to send), CS (Clear to send), and ER (Data terminal ready), and CD
(Received line signal detector) signals are used when the wiring is connected.
FP2 serial data unit side (9 pins)
Pin No. Signal name
1
Protective ground
2
Sent data
3
Received data
4
Request to send
5
Clear to send
6 Not used
7
Signal ground
8
Received line signal detector
9 Data terminal ready
With the serial data unit, the signal lines of RS and ER are normally on.
Notes
•
When using flow control with the serial data unit, the "Control
Signals CS and CD" setting in the transmission format
settings should be set to "Valid". For information on the
transmission format settings, refer to section 3.2.
•
The RS (Request to send) and ER (Data terminal ready) signals
of the serial data unit are normally on.
•
When using two channels (COM1 and COM2) setting the
control signals CS and CD to "Valid", the CS of external device
should be always on.
If the CS is off, the communication service of the other
channel will stop.
xiv
Abbrev.
Shielding wire
FG
SD
RD
RS
CS
SG
CD
ER
FP2 Serial Data Unit
RS232C device side
Symbol Pin No.
FG 1
SD 2
RD 3
RS 4
CS 5
DR 6
SG 7
CD 8
ER 20