4. RKC STANDARD COMMUNICATION
IM9000F02-E2
23
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.
c
Device address [Number of digits: 2]
This data is a device address of the REX-F9000 for polled and must be the same as the
device address set value in item "
3.4 Device address setting
" (P. 9).
d
Identifier [Number of digits : 2] (See P. 31.)
This is for identifying data requested for the REX-F9000. Always attach the [ENQ] code to
the end of the identifier.
e
[ENQ]
This is the transmission control character which indicates the end of the polling sequence.
Then, the host computer waits for response from the REX-F9000.
(3) REX-F9000 data send
If the polling sequence is received correctly, the REX-F9000 sends data in the following
format.
d
e
f
c
g
BCC
ETX
Data
Identifier
STX
c
[STX]
This is the transmission control character which indicates the start of the text (identifier and
data).
Continued on the next page.
d
e
c
Identifier
Device
address
ENQ
1
ENQ
M
0
2
Example:
