
B-63322EN-1/01 3. ELECTRICAL INTERFACE
-9-
3) Signal description
Signal
name
RS-232-C
circuit
number
Input/
output
Description
SD 103 Output Send data
RD 104 Input Receive data
See “3.1” for the bit configuration.
RS 105 Output Request to send
It is used to inform whether the remote buffer is ready to receive data or not.
When the ER signal is on and this signal is on, the remote buffer is ready to
receive data.
CS 106 Input Clear to send
It is used to know the busy status at the host computer. When the DR signal
is on and this signal is on, the host computer is regarded as being ready to
receive data.
DR 107 Input Data set ready
When this signal is on, it is considered that the preparation at the host
computer has been completed. Generally, it is connected to the ER signal of
the host computer. When this signal is off during data transmission, an
alarm occurs.
Always connect it to the ER signal of CNC side when this signal is not used.
ER 108.2 Output Data terminal ready
When this signal is on, it is considered that the remote buffer is in ready
condition.
In general, it is connected to the ER signal at the host computer. If it is
turned off during transmission of data, an alarm occurs. If this signal is not
used, always connect this to the ER signal at the CNC side.
CD 109 Input Received line signal detector
This signal is not used for connection to the host computer. Thus, connect it
to the ER signal of remote buffer side.
SG 102 Grounding for signal
FG 101 Grounding for protection
NOTE
Turn on or off signal according to the following:
-3 V or less +3 V or more
Function OFF ON
Signal Condition Marking Spacing