Yaskawa MP920 Communications Module - Manual (Page 44)

3 Communications Protocols
3.2.5 No Protocol Mode (Through Mode)
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3.2.5 No Protocol Mode (Through Mode)
„ Overview
With the no protocol mode, consecutive data in the Controller’s holding registers (MW regis-
ters) is transferred as it is.
„ No Protocol Functions
„ Transmission Parameter Setting Example
The following Connection Parameter Settings Window is displayed when the Through Mode
is used.
When using the Through Mode, specify “None” in the protocol type column in the Connec-
tion Parameter Window.
Fig. 3.5 Connection Parameter Window
„ Communications Programs
Through Mode communications can be performed by specifying No-protocol 1 (value = 2) or
No-protocol 2 (value = 3) as protocol type PRO-TYP in the MSG-SND and MSG-RCV func-
tions in the user program. With No-protocol 1 communications, data is transferred in word
units. With No-protocol 2 communications, data is transferred in byte units.
Refer to Appendix A System Functions for information on using the MSG-SND and MSG-
RCV functions.
Function Code Function Qty Remarks
− Receives messages in word units. − Message function
PRO_TYP = 2
− Receives messages in byte units. − Message function
PRO_TYP = 3