Data Communications Using Dc Code Transmission Control - Mitsubishi MELSEC L Series User Manual

7 DATA COMMUNICATIONS USING DC CODE TRANSMISSION CONTROL

Transmission
Kind of control
control function
DTR control
DTR/DSR signal
1
control
DSR control
2
RS/CS signal control
2
CD signal control
DC1/DC3 transmission
7
control
DC1/DC3 reception
DC code control
control
1
DC2/DC4 transmission
control
DC2/DC4 reception
control
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7 DATA COMMUNICATIONS USING DC CODE TRANSMISSION CONTROL
The transmission control function controls (termination, restart) the transmission and
reception of data between the Q series C24 and external device by turning transmission
control signals on and off, or by transmitting and receiving DC codes (DC1, DC2, DC3,
DC4), or informs the range of validity for the data to the external device.
The transmission control function can be set for each Q series C24 interface. The Q
series C24 uses the transmission control function set by the user to control data
communications with external devices.
Set the transmission control function to match the specifications of the external device.
The table below lists the Q series C24 transmission control functions.
Interface that can
be controlled
232 422/485
(Ignored)
1 When using full-duplex communications with bidirectional protocol data
communications, refer to the User's Manual (Basic).
2 Refer to the User's Manual (Basic) and check Q series C24 operation according to
the RS (RTS) signal and CS (CTS) signal control contents and CD terminal check
designation.
POINT
When the Q series C24 is started, DTR/DSR signal control and RS/CS signal
control are enabled.
Protocol that can be controlled
Non
MC
procedure
⎯
⎯
⎯
⎯
⎯
: Possible (transmission control used)
⎯ : Invalid
Note
Bidirectional
Cannot be used
⎯
simultaneously with
DC control.
One is selected.
Normal control.
The cable wiring
depends on whether
or not control is used.
With half-duplex
communications,
control is necessary.
⎯
Cannot be used
simultaneously with
DTR/DSR signal
control.
One is selected.
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