
6. PROTOCOL B B-63322EN-1/01
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(1) The remote buffer transmits the DC2 code.
(2) The remote buffer then transmits punch-out information.
(3) If the processing speed of the host computer is not high
enough to handle arriving data, perform one of the
following:
(a) Turn the CS signal of the remote buffer off. The
remote buffer stops data transmission within two
characters including the character being sent. (See Fig.
A.)
(b) Send a DC3 code to the remote buffer. The remote
buffer stops data transmission within the overrun,
which will be explained later, from the point when
DC3 is sent. To make the remote buffer resume data
transmission, send a DC2 code to the remote buffer.
(See Fig. B.)
(4) When the host computer completes data processing, turn
the CS signal of the remove buffer on. Then, the remote
buffer sends the data following the previous data.
(5) When data transmission is completed, the remote buffer
sends the DC4 code.
6.1.2
When the CNC Alarm/Reset is Posted to the Host
When the remote buffer becomes ready after the power is turned on,
the remote buffer turns the ER signal on, and keeps the ER signal on
until the power is turned off. When an alarm occurs in the NC, the
NAK code is sent to the host computer, and when the NC is reset, the
SYN code is sent to the host computer. This is not performed,
however, if the host computer is not ready for reception (each of the
DR, CD, and CS signals is on).