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11 INSTRUCTIONS AND FUNCTIONS
Processing Code 18
Processing Code 19
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Specifying communication control parameters
Control table format definition
Element position
Item
%(0)
Processing code
%(1)
DC control, control
by signals
%(2)
Dummy data
%(3)
Receive buffer
Reading communication control parameters
Control table format definition
Element position
Item
%(0)
Processing code
%(1)
DC control, control
by signals
%(2)
Dummy data
%(3)
Receive buffer
• It is possible to set or read communication control parameters of an open
communication channel using these codes.
• Specify 18 for the processing code in order to set communication control
parameters.
Specify 19 for the processing code in order to read communication control
parameters.
• Specify the control by signals in the following manner, using the higher 8 bits of
%(1).
3
2
1
1: The CS control is enabled in case of RS-232C regardless of the specified data.
• Specify the DC control in the following manner, using the 1st and 3rd bits in the
lower 8 bits of %(1).
3
2
1
Description
Specify the processing code.
Specify the DC control method in the lower byte
and the signal control method in the higher byte.
The specification is not necessary (work area
used by the system).
Specify the size of the receive buffer.
Description
Specify the processing code.
Read the status of DC control into the lower
byte and the status of the control by signals into
the higher byte.
This data has no meaning (work area used by
the system).
Read the size of the receive buffer.
0
(Bits marked with X are ignored.)
RS (RTS) control
DTR (ER) control (ignored in RS-422)
CS (CTS) control (ignored in RS-232C)
DSR (DR) control (ignored in RS-422)
0
(Bits marked with X are ignored.)
DC1/DC3 reception control
DC1/DC3 transmission control
MELSEC-Q
1: Control
enabled
1
0: Control
disabled
1: Control
enabled
0: Control
disabled
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