Instruction manual

5. RKC COMMUNICATION PROTOCOL
IMR01H02-E3
25
5.2 Selecting
Selecting is the action where the host computer requests one of the connected controllers to receive
data. An example of the selecting procedure is shown below:
5.2.1 Selecting procedures
(1) Data link initialization
Host computer sends EOT to the controllers to initiate data link before selecting sequence.
(2) Sending selecting address from the host computer
Host computer sends selecting address for the selecting sequence.
!"
Address
(2 digits)
• Multi-point mode
The device address specifies the controller to be selected and each controller must have its own
unique device address.
For details, see 4.2 Setting the Communication Parameters (P. 9).
• Single mode
This data is for representing the device address and channel number of the controller to be
selected. When selecting any identifier without a channel number, that channel number is
ignored. Each address is calculated as follows.
Calculation method of address:
Address = Device address of controller + Controller channel number - 1
Continued on the next page.
Controller send
[ ] [ ] [Data]
Host com
p
uter send
Host computer
send
[BCC]
(1)
(2)
(5)
(3)
(4)
(6)
[
Address
]
No res
p
onse
E
O
T
E
T
X
E
O
T
S
T
X
A
C
K
N
A
K
(7)
Memory area
number
Identifier