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Power Supply BL-U1
5
Communication
5.1 Outline of Communication types
You can perform all multidrop link communication by sending commands from the
host computer to the BL series.
The communication of the multidrop link is classified into the following two types:
Data communication
For sending read data from the BL-series to the host computer. When data receive commands (polling commands) are sequentially sent to each BL series connected to the host computer, the read data is sent to the host computer.
The read data is stored in the BL series’ transmission buffer, and the data stored
in the transmission buffer is called using the polling command.
Command communication
Using serial communication commands allows direct control of the BL series or
change/confirmation of the BL series’ settings.
5.2 Communication Format
All multidrop link communication is done in the following format. Send any command in this format and the BL Series will respond in the format shown below.
<Communication format>
STX
mmm
nn
Data/Command/Response
cc
ETX
Delimiter
No. of data
ID No.
Contents of data
Checksum
Delimiter
1
2
3
4
5
6
Detail of each data:
1, 6 Delimiter: All the data should start with [STX](02h) and should end with
[ETX](03h). This cannot be changed.
2
mmm/No. of data: Total number of characters of above data 2 to 5
should be entered. (Do not count [STX] and [ETX].)
When you send [STX][mmm][03][SSET][cc][ETX], for example, the number of characters will be; 3+2+4+2=11Thus, [mmm] is 011.
3
nn/ID No.: Specify the ID No. of the BL Series reader you want to send/
receive. ID Nos. should be from 01 to 31.
4
Data/Command/Response: Two commands can be used for multidrop
link communication. [P] for polling and [C] for clearing data.
Name
Command
Response
Description
Polling comP
mand
Data is
returned
if any
data is
stored.
[OVER] is
returned if
the buffer is
full.
Command to ask
whether the BL series’
transmission buffer contains any data.
Data clear
command
[NG] is
returned if
the data has
[OK] is returned if
the data is cleared. been
already
cleared.
This command clears
one piece of the sent
data, and completes a
series of data communication.
5
C
[e] is
returned
if no data
is stored.
cc/Checksum: Add the checksum when you send the data. When the response is returned from BL, the checksum follows the data. Determine
the checksum by calculating the Exclusive OR of each data from 2 to 4
as follows.
93
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