D-10
FX Series PLC User's Manual - Data Communication Edition
Computer Link
2 Specifications
2.1 Communication Specifications (Reference)
2. Specifications
This chapter explains the communication specifications and performance.
2.1 Communication Specifications (Reference)
Communication is executed within the specifications shown in the table below. The baud rate, etc. can be
changed in the parameter settings of a programming tool or in a sequence program.
*1. Available only in FX
3G PLC.
Item Specifications Remarks
Number of connectable units 16 maximum
Transmission standard RS-485 or RS-232C standard
Maximum total extension
distance
RS-485: 500 m (1640' 5") or less
[50 m (164' 0") or less when 485BD is included in
system]
RS-232C: 15 m (49' 2") or less
Distance varies depending
on communication
equipment type.
Protocol type Computer link (dedicated protocol)
Formats 1 and 4 are
applicable.
Control procedure —
Communication method Half-duplex, bidirectional communication
Baud rate
300, 600, 1200, 2400, 4800, 9600, 19200 or
38400 bps
*1
Character format —
Start bit Fixed
Data bit 7 or 8-bit
Parity bit None, odd or even
Stop bit 1 or 2-bit
Header Fixed
Terminator Fixed
Control line Fixed
Sum check Provided or not provided
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