
5.CONNECTION TO CNC PERIPHERALS B-63943EN/02
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Time chart when the NC receives data (Read into memory)
(1) NC outputs DC1.
(2) The I/O device starts sending data upon receiving DC1.
(3) NC sends DC3 when NC processing is delayed.
(4) The I/O device stops sending data to NC after receiving DC3.
The device may send up to 10 characters after receiving DC3. If
it sends more than 10 characters, alarm 087 will occur.
(5) NC reissues DC1 upon completing delayed processing.
(6) The I/O device restarts data output upon receiving the DC1 code
(the data must be the next data to the preceding.)
(7) NC sends DC3 upon completing data read.
(8) The I/O device stops sending data.
10ms or longer
100ms or longer
DC3
ER code
DC1 DC3 DC1
1ms or longer
Up to 10 characters
ER
(output)
RS (output)
SD (output)
RD (input)
DR (input)
CS (input)