
B–63083EN/02
5. CONNECTION TO CNC PERIPHERALS
66
Signal
name
RS–232C
circuit
number
I/O Description
SD 103 Output Sending
data
Start bit Stop bit
RD 104 Input Receivin
g
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
signal are set, the NC can send data. If
external device processing is delayed
by a punching operation, etc., NC data
sending can be stopped by turning off
this signal after sending two
characters, including the data being
sent currently. 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
operate, this signal is set. This signal
should usually be connected to the
signal indicating external device power
supply being on. (ER signal of external
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 Output NC ready
to
operation
This signal is set when the NC is ready
to operate. External device should
regard 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
connections with external device, the
signal circuit must be strapped, inside
the connecting cable, to the ER signal
circuit.
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–232C interface