
B–63503EN/02
5. CONNECTION TO CNC PERIPHERALS
61
Signal
name
RS–232–C
circuit
number
I/O Description
SD 103 Out-
put
Sending
data
Start bit Stop bit
RD 104 Input Receiv-
ing
data
ON
OFF
4
(When ISO code “0” is sent)
123 8567
RS 105 Input Sending
request
This signal is set to on when NC starts
sending data and is turned off when
transmission ends.
CS 106 Input Sending
permitted
When both this signal and the DR sig-
nal are set, the NC can send data. If ex-
ternal device processing is delayed by
a punching operation, etc., NC data
sending can be stopped by turning off
this signal after sending two charac-
ters, including the data being sent cur-
rently. If this signal will not be used,
make sure to strap this signal circuit to
the RS signal circuit.
DR 107 Input Data set
ready
When external device is ready to oper-
ate, this signal is set. This signal
should usually be connected to the
signal indicating external device pow-
er supply being on. (ER signal of exter-
nal device). See Note below.
The NC transfers data when this signal
is set. If the signals turned off during
data transfer, alarm 086 is issued. If
the DR signal will not be used, make
sure to strap this signal circuit to the ER
signal circuit.
ER 108.2 Out-
put
NC
ready to
operation
This signal is set when the NC is ready
to operate. External device should re-
gard the SD signal as being significant
when the ER signal is set.
CD 109 Input Signal
quality
signal
Since this signal is not used in connec-
tions with external device, the signal
circuit must be strapped, inside the
connecting cable, to the ER signal cir-
cuit.
SG 102 Signal
grounding
FG 101 Frame
grounding
NOTE
Signal on/off state is defined as follows;
–3V or lower
Signal Condition
+3V or higher
Function
Marking
OFF
Spacing
ON
Signal description of
RS–232–C interface