FP
Σ
User's Manual
8.2 Communication Cassettes
159
8.2 Communication Cassettes
There are several types of communication cassettes, each having a particular field of
application (see page 163):
Types
•
FPG-COM1: 1-channel RS232C type (see page 159)
•
FPG-COM2: 2-channel RS232C type (see page 160)
•
FPG-COM3: 1-channel RS485 type (see page 160)
•
FPG-COM4: 1-channel RS485 and 1-channel RS232C combination type (see page
8.2.1 Communication status LEDs
The labeling of the communication status LEDs on the CPU refers to the 2-channel RS232C
type communication cassette (FPG-COM2). For all other types, the following table applies:
LED
FPG-COM1
FPG-COM2
FPG-COM3
FPG-COM4
S
SD SD SD
RS485:
SD
COM1
R
RD RD RD
RS485:
RD
S
RS SD —
RS232C:
SD
COM2
R
CS RD —
RS232C:
RD
SD: Send Data (output)
RS: Request to Send
RD: Receive Data (input)
CS: Clear to Send
The LED flashes while communication is taking place and goes out when there is no
communication.
8.2.2 FPG-COM1: 1-Channel RS232C Type
This communication cassette is a 1-channel unit with a five-wire RS232C port. RS/CS control
is possible.
Terminal layout
Pin Name
Signal direction
Port
SD
Send Data
PLC
→
External device
RD
Receive Data
PLC
←
External device
RS
Request to Send
PLC
→
External device
CS
Clear to Send
PLC
←
External device
SG
Signal Ground
—
COM 1
RS (Request to Send) can be controlled by the SYS1 instruction.
Data cannot be sent unless the pin CS (Clear to Send) is on. When connecting to a three-wire
port, short-circuit the RS and CS pins.
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