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FX Series Programmable Controllers Points Of Technique 10
10-18
10.14 Communication Format
10.14.1 Specification of the communication parameters:
Items such as baud rates, stop bits and parities must be identicall
y
set between the two
communicatin
g
devices. The communication parameters are selected b
y
a bit pattern which is
stored in data re
g
ister D8120.
General note re
g
ardin
g
the use of Data re
g
ister D8120:
This data re
g
ister is a
g
eneral set-up re
g
ister for all ADP t
y
pe communications. Bits 13 to 15 in
the 232ADP units should not be used. When usin
g
the FX-485 network with 485ADP units bits
13 to 15 should be used instead of bits 8 to 12.
D8120
Description
Bit (bn)status
0 (OFF) 1 (ON)
b0 Data len
g
th 7 bits 8 bits
b1
b2
Parit
y
(b2, b1)
(00) : No parit
y
(01) : Odd parit
y
(11) : Even parit
y
b3 Stop bits 1 bit 2bits
b4
b5
b6
b7
Baud rate - bps
(b7, b6, b5, b4)
(0011): 300 bps
(0100): 600 bps
(0101): 1200 bps
(0110): 2400 bps
(b7, b6, b5, b4)
(0111): 4800 bps
(1000): 9600 bps
(1001): 19200 bps
b8 Header character None D8124, Default : STX (02H)
b9 Terminator character None D8125, Default : ETX (03H)
b10
b11
b12
Communication Control
(see timin
g
dia
g
rams
pa
g
e 10-20 onwards)
No Protocol
(b12, b11, b10)
( 0, 0, 0) : RS Instruction is not bein
g
used (RS232C interface)
( 0, 0, 1) : Terminal mode -RS232C interface
( 0, 1, 0) : Interlink mode - RS232C interface (FX2N V2.00 or above)
( 0, 1, 1) : Normal mode 1- RS232C, RS485(422) interfaces (RS485
FX2N(C) onl
y
)
( 1, 0, 1) : Normal Mode 2 - RS232C interface (FX onl
y
)
Computer Link
(b12, b11, b10)
( 0, 0, 0 ) : RS485(422) interface
( 0, 1, 0 ) : RS232C interface
b13
FX-485
Network
Sum
Check
No Check Added automaticall
y
b14 Protocol No protocol Dedicated Protocol
b15 Protocol Format 1 Format 4