Yaskawa MP920 Communications Module - Manual (Page 31)

2 Communications Modes
2.3.2 General-purpose Message Transmissions
2-6
2.3.2 General-purpose Message Transmissions
The general-purpose message transmission mode transfers consecutive data in MW regis-
ters, without any processing, using the transmission and reception functions in user pro-
grams. The communications protocol.
An application-specific protocol can be established by transferring packet data using consec-
utive MW registers.
Data is transferred with no protocol via the line from the ST#1 using the MESSAGE SEND
function (MSG-SND).
The ST#2 uses the MESSAGE RECEIVE function (MSG-RCV) to receive data from ST#1.
No response is returned to ST#1.
PS-01 CPU-01 PS-01 CPU-01
ST#1
MSG-SND
Parameters
Transmission device: 215IF,
217IF, and 218IF
Communications protocol:
No protocol
EXECUTE BUSY
ABORT COMPLETE
PARAM
MSG-RCV
EXECUTE BUSY
ABORT
PARAM
ST#2
Commu-
nications
Module Commu-
nications
Module