
B–63083EN/02
11. REMOTE BUFFER INTERFACE
(INCLUDING FANUC DNC1 AND DNC2)
277
- Electrical interface
The following two types of interface are prepared as standard
specifications.
D RS–232–C Interface
D RS–422 Interface
RS–233C RS–422
Interface
Serial voltage interface
(start–stop)
Balanced transmission serial
interface (start–stop)
Baud rate 50 to 19,200 BPS 50 to 86,400 BPS (*)
Cable
length
100m (4800BPS or less)
50m (9600BPS)
Varies according to I/O device.
Approx. 800 m (9600 BPS or
less)
50m (19,200 BPS or more)
- Software interface
The following three protocols are prepared as the communication
protocols between the remote buffer and host computer. The protocol
can be selected by a parameter according to the specifications of the
device to be connected.
Protocol Features Interface Maximum
transfer rate
Protocol A Handshake method. Sending and
p
RS–232C 19200 BPS
stations.
RS–422 86400 BPS
Extended
protocol A
Similar to protocol A. Enables
high–speed transfer of the NC program
to meet high–speed DNC operation.
RS–422 86400 BPS
Protocol B Controls communication with control
p
ut from the remote buffer
RS–232C 19200 BPS
co
es ou
pu
rom
e remo
e
u
er.
RS–422 86400 BPS
NOTE
(*) The average data transfer rate is lower than the maximum
transfer rate.
FANUC DNC2 is a communication protocol that provides an RS–232C
interface between the CNC and a personal computer (PC). This interface
enables the CNC and PC to exchange data with each other. The hardware
used to connect the CNC and PC is the same as that used for remote buffer
connection.
For information about the specifications and other details of FANUC
DNC2, refer to “FANUC DNC2 Description (B–61992E).”
FANUC DNC1, developed by FANUC, is a high–speed network
supporting cell–based communication.
The hardware connection and other specifications of the DNC1 function
are explained. When using DNC1, refer to the following document.
Title Number
FANUC DNC1 Description B–61782E
Explanations
D Interface between the
remote buffer and host
computer