Rs-232C Interface .O - YASKAWA YASNAC J50 Connecting Manual

14.3 RS-232C INTERFACE
(1) Transmission Mode
Start-stop synchronization: Each data bit is preceded by a start
signal, and followed by a stop signal.
A SINGLE START-STOP CHARACTER
r
DO DI D2 D3 D4 D5 D6 D7
OFF
+
START
DATA BIT
STOP BIT
BIT (1 OR 2 BITS)
Table 14.1
Vo< -3V
00> +3V
Function OFF ON
Signal Condition
Mark
Space
Logic
1 0
(2) Codes Used
The following two types of codes areused, and are selectively
used by parameters (#6026D5, #6028D5).
. EIA codes or ISO codes
. EIA codes or 1S0 codes + control codes (DC 1- DC4)
To use control codes, the machine to be controlled must be
able to discriminate codes DC1 through DC4. Codes DC1 -
DC4 are as follows.
(5) Interconnection
Table 14.3 RS-232C interface Connecting Cable(A)
NC (DB-25P)
External
Equipment
Connections
Symbol
Signal Name
Pin
No.
Symbol
FG / Frame grounding / 1 10—o I FG
SD
Sending data
2
SD
RD Receiving data 3 RD
RS Sending data 4 0 RS
Cs Capable of sending
5 G
Cs
DR Data set ready 6
\-o
DR
SG Signal grounding 7
0
\
SG
ER Data terminal ready 20 IO BUSY
I
Ii
NC outputs control codes DC 1- DC4 to start and stop the machine,
but the machine can not output control codes to control the NC.
However, when the machine under control is unable to process data
in time, it can control the CS signals of the NC to halt the data
outputting of the NC.
When CS signals of the NC are not used, short CS and RS as
shown Table 14.4.
Table 14.4 RS-232C Interface Connecting Cable (B)
External
NC (DB-25P)
Equipment
Connections
Symbol
Pin
Signal Name ~n
Symbol
FG I Frame grounding
111
0—------ j FG
Table 14.2
SD I
Sending data /21~/+SD
Character
8 7 6 5 4 :;; 3 2 1
Dc ~ Tape reader
start
o 0
Tape reader
'C2 punching
o
0
Tape reader o
DC3
stop
o
0 0
DC4
Tape punch
o 0
release
(3) Transmission Baud Rate
Transmission baud rates can be selected at any rate between 50
and 9600 bauds with parameters.
Refer to (7) in Par. 14.2.
(4) Cable Length
The permissible maximum cable length varies with the machine
to be controlled. Refer to the machine builder's manual.
(Standard maximum cable length is 15 m.)
RD Receiving data
3 (3'"W RD
RS
Sending data
4 RS
Cs Capable of sending 5 Cs
DR Data set ready 6 A-) DR
SG Signal grounding 7
0
0
SG
ER Data terminal ready 20
0
bl
ER (OR
IO ARARM)
~Description of signals
FG: Safety grounding
SD : Transmission data (output)
RD : Received data (input)
'1!'
I
I
I
1,,
START
~STOP