
4. PROTOCOL A B-63322EN-1/01
-18-
Command
Origin
station
Functions Data part
Executed command
at CNC side
EOD H Response corresponding to GTD
Transmit this command when the GTD has been
received while the transmission of NC data has
been completed.
Meaningless
CLB H Buffer clear
It can be transmitted as the response of SAT when
the buffer at the remote buffer side is to be cleared.
Meaningless
RDI H DI reading request
It is used to request transmission of image of
specified 8-bit DI.
The DI image at that time is responded by the SDI
command in the remote buffer.
This command can be transmitted as responses of
SAT and GTD.
Meaningless
SDI R Notice of DI
It is used to transmit the signal status of DI as the
response of RDI command.
The host should transmit the response of command
received immediately before transmitting the RDI
after receiving this command.
DI image Response
corresponding to the
GTD/SAT
SDO H DO output request
It is used to command that the 8-bit image of data
part should be output to the DO.
It can be transmitted as responses of SAT, GTD,
and SDI.
DO image
RTY R/H Request of retransmission
It is used to request the retransmission of the same
message as before.
Immediately transmit this command when a
transmit error is detected during reception of
messages.
Reason for
retransmission
Command
transmitted
immediately before