D-94
FX Series PLC User's Manual - Data Communication Edition
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9 Related Data
9.2 Details of Related Devices
2. Cautions on use
Error codes are not cleared even after communication recovers its normal status.
Serial communication errors are cleared in FX
3S, FX3G, FX3GC, FX3U and FX3UC PLCs when the power is
turned off and on.
Serial communication errors are cleared in other PLCs when the mode is switched from STOP to RUN.
9.2.8 Communication format setting [D8120 and D8420]
These devices set the serial communication format.
1. Detailed contents
These devices set the serial communication format. In FX1S, FX1N, FX1NC, FX2N, FX2NC, FX3S, FX3G, FX3GC,
FX
3U and FX3UC PLCs, the contents set in parameters are transferred to these devices when the power is
turned ON.
In FX
2(FX), FX2C and FX0N PLCs, set the communication format using a sequence program, and then turn
ON the power.
In all PLCs except FX
3G, FX3GC, FX3U and FX3UC PLCs using communication port ch1, use D8120.
Set the communication format using parameters when using the communication port ch2 in FX
3G, FX3GC,
FX
3U and FX3UC PLCs.
Use D8420 for confirmation.
The tables below show the setting details.
• Contents of D8120
*1. This setting is available only in FX
3S, FX3G, FX3GC, FX3U and FX3UC PLCs.
Bit No. Name
Contents
0 (bit = OFF) 1 (bit = ON)
b0 Data length 7-bit 8-bit
b1
b2
Parity
b2, b1
(0, 0): Not provided
(0, 1): Odd
(1, 1): Even
b3 Stop bit 1-bit 2-bit
b4
b5
b6
b7
Baud rate
(bps)
b7, b6, b5, b4 b7, b6, b5, b4
(0, 0, 1, 1): 300 (0, 1, 1, 1): 4800
(0, 1, 0, 0): 600 (1, 0, 0, 0): 9600
(0, 1, 0, 1): 1200 (1, 0, 0, 1): 19200
(0, 1, 1, 0): 2400 (1, 0, 1, 0): 38400
*1
b8 Header Not provided Provided (D8124) Initial value: STX (02H)
b9 Terminator Not provided Provided (D8125) Initial value: ETX (03H)
b10
b11
Control line
Com-
puter
link
b11, b10
(0, 0): RS-485/RS-422 interface
(1, 0): RS-232C interface
b12 Not applicable
b13 Sum check Not added Added
b14 Protocol Not used Used
b15
Control
procedure
Format 1 Format 4
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