Panasonic FP E Series - A Transmission Error Has Occurred through RS485; No Communication Is Available through RS232 C

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8.2.7 A Transmission Error has Occurred through RS485
Procedure 1
Check to make sure the transmission cables have been securely connected between the two (+)
terminals and two (−) terminals of the units, and that the final unit has been correctly connected.
Procedure 2
Check if the transmission cables are within the specifications range. At this point, make sure all of the
cables in the link are of the same type, and that multiple types of cables are not being used.
• Do not designate any unit other than those at both ends of the network as a terminal station.
Reference:
For the specifications range of the transmission cables, refer to <7.3.3 Selection of Transmission
Cables>.
Procedure 3
Check that link areas do not overlap.
8.2.8 No Communication is Available through RS232C
Condition: No communciation with 1-channel type RS232C cassette
Procedure 1
Check if the CS signal is on.
When the “COM.2 R” of the communication cassette LED does not light, the CS signal is not on.
If the three-wire type is used, connect the RS signal and the CS signal of the communication cassette,
and turn the CS signal on.
Reference: <7.1.2 Types of Communication Cassette>