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3. PROCEDURE
UP TO DATA COMMUNICATIONS DESCRIBED IN THIS GUIDEBOOK
MELSEC QnA
3.3 External Wiring
The RS-232C cable wiring diagram is shown below.
(When connected to a device that does not turn ON the CD signal.)
AJ71 QC24
Name
External Cable Connection
Signal
Sianal
Name
tion
Name
Device and Signal Direc-
Pin
No.
FG
I
~
1
FG
F r a m e Ground
~~
SD
2
SD
Receive
Data
RD
3
RD
Send Data
r l
1 :
1
Send
Request to
Clear to Send
I
DSR
1
6
DSR
1
Data
Set
\ /
I
CD
I
Carrier
Detection
DTR
Data Terminal
DTR
20
Ready
Contents
(Based on External Device)
Sisnal pin that sends data.
Sianal pin that receives data.
I
Signal pins that turn ON and send a
signal to the local station and simulta-
neously inform the opposite device
that the local station has data to send
when the local station is ready to send.
Pin that receives the ready signal from
the opposite device.
Signal ground pin
Pin that receives the ON signal when
there is send data from the opposite
deivice.
Pin used by the local station to show
that it is readv to orserate.
L - - -
-
Conect the cable to match the specifications
of the external device.
-
-
-
-
The RS-232C connector used is shown below. Connect the connector of the
opposite device matched to this connector to the cable.
20 pin D sub (female) screw type
DDK Electronics Ltd. 17LE-13250-22-D2AC
3.4
External Device Setting
Set the external device as shown below.
RS-232C-0
..........................
4800 bauds 7 bits* even parity stop bit 1 No X parameters
Printer
..................................
24-bit system
Memory size (KB)
.................
640
Screen display attribute.
.......
White
Numeric coprocessor
...........
None
BOOT device
.......................
Standard
Numeric coprocessor 2
........
None
3 - 8
mode, 8 bits is set.
I
I
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