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Software
Installation
51
5
6
Programming
RS
485
The
majority
communicative
operation
of
the
RS
‐
485
is
in
the
same
of
the
RS
‐
232.
When
the
RS
‐
485
precedes
the
transmission,
which
needs
control
the
TXC
signal,
and
the
installing,
steps
are
as
follows:
Step
1:
Enabled
TXC
Step
2:
Send
out
data
Step
3:
Waiting
for
data
empty
Step
4:
Disabled
TXC
Note
8:
Please
refer
to
the
section
of
the
“Serial
Ports”
in
the
Chapter
6
“Technical
Reference”
for
the
detail
description
of
the
COM
ports
register.
5
6
1
Initialize
COM
port
Step
1:
Initialize
COM
port
in
the
receiver
interrupt
mode,
and
/or
transmitter
interrupt
mode.
(All
of
the
communication
protocol
buses
of
the
RS
‐
485
are
in
the
same.)
Step
2:
Disabled
TXC
(transmitter
control),
the
bit
0
of
the
address
of
4
just
sets
“0”.
Note
9:
Control
the
JetBox
system
“DTR”
signal
to
the
RS
‐
485
TXC
communication.
5
6
1
Send
out
one
character
(Transmit)
