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5-35
5 Serial Gateway
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
5-6 Co
mm
u
n
ication
s Fram
es
5
5-6-2 Modb
us-R
T
U
z
Response Frame
Frame before Conversion
Header
Modbus-RTU frame
Start (silent
interval of
3.5
characters)
(See note.)
End (silent
interval of
3.5
characters)
(See note.)
Slave
address
(1 byte)
Command
FUNCTION
code
(1 byte)
Communications data
(n bytes)
Error
check
CRC
(1 byte)
Command
end code
Frame after Conversion
Modbus-RTU
(command section only)
FUNCTION
code (1 byte)
Slave
address
(1 byte)
SRES
MRES
SRC
Remote
network
address
(DNA)
Remote
node
address
(DA1)
Remote
unit
address
(DA2)
MRC
04
Serial port
allocated
address
00 hex
Serial
port
unit
address
28
or local
network
address
or local
network
node
address
Etc.
User-
speci-
fied
User-
speci-
fied
Communica-
tions data
(n bytes)
Содержание CJ1W-SCU22
Страница 192: ...4 Using Protocol Macros 4 56 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 250: ...6 No protocol Mode 6 22 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 460: ...A Standard System Protocol R 126 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 473: ...Index 1 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494 I Index...