Table of Contents
Advertisement
3. PROCEDURES PRIOR TO COMPUTER LINK FUNCTION
OPERATIONS DESCRIBED
IN
THIS GUIDEBOOK
MELSEC-A
3.3
External Wiring
The following table shows the connection diagram of the RS-232C cable.
AJ71UC24
I
Cable
I
Computer
Signal Name
Description
(Status on Computer Side)
I
I
I
I
FG
[
1
FG
Frame
ground
I
Cable shield terminal
SD
I
2
SD
Send data
I
Signal terminal which sends data
3
RD
I
Received data
1
Signal terminal which receives data
DSR
6
DS R
SG
7
SG
CD
8
CD
DTR'
20
DTR
Reauest to w n d
Clear to send
Data set ready
Signal grounding
Data channel
receiving carrier
detect
Data terminal ready
-
Signal terminals which, as soon as
the self-station is ready to send, are
turned
on and send data to the CS of
the station (simplification) while
informing the communicating device
that data Is to be sent.
Terminal for receiving an operation
ready signal from the communicating
device
Signal grounding terminal
Terminal which receives
an ON
signal
when data is to be transmitted from
the communicating device
Terminal which informs the
communicating device that the self-
station is ready to operate
'
.-----
Connect the cable according to the specifications of
!-----Since the following type of RS-232C connector is used, connect a suitable mat-
the computer.
ing connector for this one to the cable.
D-sub 25-pin (female) screwed type
17LE-13250-22-D2AC manufactured by DDK
Y
IPOINTI
1
The above diagram shows the wiring with a module that cannot turn on
the CD signal in the computer link module. Data communications can
be executed by inserting the following in the sequence program.
I
p
k
TO H0008
HlOB K1
K1
4
No
CD terminal check
P
......
I
3.4
Setting the Computer
Set the computer according to the following:
RS-232C-0
..............
.4800 baud rates,
7 ,
even parity,
Printer
..................
.24 dots, ANK
Memory size (KB)
........
.640
1 stop bit, no X parameter
Screen display attribute
. . . .
White
Numeric data processor
. . . .
None
Boot device
. . . . . . . . . . . . . . .
Standard
Numeric data processor
2
. . .
None
'Select 8 bits
for
the bidirectional
A
3 - 6
Advertisement
Table of Contents
