Polling Procedure - RKC INSTRUMENT CB100 Instruction Manual

4. COMMUNICATION PROTOCOL

4.1.1 Polling procedure

(1) Initialize of data link
Host computer sends [EOT] for initializing of data link before polling sequence.
(2) Polling sequence send
Host computer sends polling sequence with a format shown below.
"
Device
address
" " " "
Device address [Number of digits: 2]
This data is a device address of the controller for polled and must be the same as the device address
set value in item "3.3 Device address setting" (P. 7).
# # # #
Identifier [Number of digits : 2] (See P. 28.)
This is for identifying data requested for the controller. Always attach the [ENQ] code to the end of
the identifier.
$ $ $ $
[ENQ]
This is the transmission control character which indicates the end of the polling sequence. Then, the
host computer waits for response from the controller.
(3) Controller data send
If the polling sequence is received correctly, the controller sends data in the following format.
"
STX
" " " "
[STX]
This is the transmission control character which indicates the start of the text (identifier and data).
20
# $
ENQ
Identifier
# $
Identifier Data
Example:
ENQ
0 2 M 1
& %
ETX BCC
IMCB03-E3