Download MELSEC-Q/L Serial Communication Module User`s Manual

10 ON-DEMAND DATA COMMUNICATIONS USING USER FRAMES
10.4 On-Demand Function Control Procedure During User Frame Use
The following uses examples to explain the control procedure when using the ondemand function to frame to transmit on-demand data to an external device by user
frame.
10.4.1 Data communication using the ASCII code
The following shows the control procedure when performing switch settings via GX
Developer and registration via GX Configurator-SC.
(1) Switch settings via GX Developer
1) Set the "Communication protocol setting" to any one of the "MC
protocol (formats 1 to 4) ".
2) Set the "Station number" to "0".
(2) Registration via GX Configurator-SC
Register as follows when transmitting a user frame, user selected transmission
data ( 1) or a combination of user frames.
1) "User frame registration" screen
User frame No.
02H (
2)
3EBH(1003)
User frame
Contents of user frame
(Registration code)
registration
02H
F9H, 00H, 00H, FFH, FFH, 00H
STX to host station No. data code
matched to QnA compatible 3C
frame format 1
QnA compatible 3C frame format
401H(1025)
03H, FFH, F1H
1 corresponding ETX, sum check
code data code
2) "Transmission control and others system setting" screen, "MC protocol
system setting" screen
• Set the "Word/byte units designation" to word units.
• Set the "On-demand user frame designation" items to the following:
First frame No. 1st: 02H
First frame No. 2nd: 3EBH
Last frame No. 1st: 401H
Last frame No. 2nd: 0H (No specification)
1 Use the ONDEMAND instruction to designate the transmission data to
two words (1234H, 5678H).
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