MPH-02, MPB-02, MPD-02
Handling, Diagnostic and Service Functions
10-81
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Communication with ASCII Protocol
Addressing a Specific Bus Node
In order to start the communication with a bus node, this node has to be
specifically addressed by a CHANGE DRIVE command (CD command)
indicating the drive address. With each CD command the drive addressed
via the indicated address is activated; all other drives are thereby
switched to the passive mode. The drive that has been addressed
responds with its prompt. As from now the communication with the
activated drive continues until another CD command causes the switching
to another drive.
Step 1
Send request e.g.: "BCD:01" (CR)
(with address 1)
Step 2
Drive received character, drive sends
prompt if address is the same
Character sequence":>" found in
receiver buffer?
Pattern found
Transmission error
Drive is "open"
-> ready for communication
Step 3
Check receiver buffer for
pattern."E01:>"
yes
yes
no
Contents of receiver buffer:
[BCD:01] "E01:>"
The characters in [ ] only appear if
another unit on bus is open.
Timeout ?
no
no
Communication with drive not
possible
-> check address
-> check setting
-> check connection
yes
FD5002B1.WMF
Fig. 10-41: Addressing a bus node
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
