F-88
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
12 Related Data
12.2 Details of related devices (RS instruction)
12.2.9 Communication format setting [D8120]
This device sets the communication format.
1. Detailed contents
This device can set the data length, parity, baud rate, etc.
The table below shows the contents of the communication format setting.
*1. This setting is available only in FX
3G PLCs.
*2. Make sure to set as "0" when using non-protocol communication.
*3. When using the RS-485/RS-422 interface, only FX
1S, FX0N, FX1N, FX2N, FX3G, FX3U, FX1NC, FX2NC,
and FX
3UC PLCs are applicable.
2. Cautions on use
In all PLCs except FX2(FX), FX2C, and FX0N PLCs, the communication format can be set using parameters.
When setting the communication format in FX
0N PLCs, set the communication setting latched (battery
backed) device (M8120) to ON.
12.2.10 Amount of remaining send data [D8122]
This device stores the amount of remaining send data.
1. Detailed contents
This device stores the amount of remaining send data in 8-bit (1 byte) units.
Only data in communication frames are regarded as targets of counting.
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
Non-
protocol
commu-
nication
b11, b10
(0, 0): Not provided <RS-232C interface>
(0, 1): Standard mode <RS-232C interface>
(1, 0): Interlink mode <RS-232C interface>
(FX
2N whose version is Ver. 2.00 or later, FX3G, FX3U, FX2NC, and
FX
3UC)
(1, 1): Modem mode
<RS-232C interface, RS-485/RS-422 interface
*3
>
Com-
puter
link
b11, b10
(0, 0): RS-485/RS-422 interface
(1, 0): RS-232C interface
b12 Not applicable
b13
*2
Sum check Not added Added
b14
*2
Protocol Not used Used
b15
*2
Control procedure Format 1 Format 4
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