Panasonic FP E Series User Manual page 158

Communication cassette LED indication
The indication of the control unit is for 2-channel RS232C type. For the other types, refer to the following.
Indication of
control unit
SD
RD
RS
CS
LED Communicating: Flashes
No communication: Lights out
SD: Sent data (output)
RD: Received data (input)
Difference of dimensions
AFPG801
AFPG802
AFPG803
7-8
AFPG801 AFPG802
SD
RD
SD
RD
AFPG806
Note) This is longer by 5mm.
AFPG803 AFPG806
RS485
SD
SD
RS485
RD
RD
RS232C
Not used
SD
RS232C
Not used
RD