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α
2 Simple Application Controllers
The Command String 7
7 - 16
7.5 Character Area Data Transmission
The Data Transmission area is the important segment of the message that the user must
address correctly in order to read/write the from/to the
α
2 Series Controller. The procedure to
address all internal devices is identical,
Refer to section 7.3.7 for respective device codes.
7.5.1 Read Data Transmission
The READ Data Transmission area is identical in reading BIT or WORD information.
Format B - READ Message
Example - READ Message
Table 7.11: Data Transmission explained
Control
element
Hex Description
No. of devices 01H There is only one intended device to be READ from the controller
Device Code 41H The device code is for the Input Device.
Device No. (LB) 0CH
The lower byte in conjunction with the higher byte indicates Input 11
is the intended device.
Device No. (HB) 00H
The higher byte in conjunction with the lower byte indicates Input 11
is the intended device.
S
T
X
E
T
X
No. comm
bytes
Format No.
Station
No.
Command
No. of devices
Device code
Device No.
(LB)
Device No.
(HB)
Sum check
(LB)
Sum check
(HB)
Data Transmission
Data Transmission
Data Transmission
Data Transmission
No. of
devices
01H
Device No.
(LB)
0CH
Device
code
41H
Device No.
(HB)
00H