Fanuc C-Executer Operating Manual
B-62443EN-3/03E
- 772 -
2. Interface
[1] Connection
CNC Serial device
----------+ +------------
| |
SD ------------------------------------------------> RD
RD <------------------------------------------------ SD
| |
RS ------------------------------------------------> CS
CS <------------------------------------------------ RS
| |
ER ------------------------------------------------> DR
DR <------------------------------------------------ ER
| |
CD <------------------------------------------------ CD
| |
SG --+-------------------------------------------+-- SG
FG --+-------------------------------------------+-- FG
| |
----------+ +------------
SD : Send data [output]
RD : Receive data [input]
RS : Request to send [output]
This signal is used for flow control by hardware signal
handshake. This signal requests or allows external serial
device to send data. The serial communication driver will
bring this signal OFF , when receive buffer is full. External
device must not send more than 10 characters after RS is OFF.
CS : Clear to send [input]
This signal is used for flow control by hardware signal
handshake. This signal indicates that external serial device
is requesting or allowing data to be sent. The serial
communication driver sends data while this signal is ON.
ER : Data terminal ready [output]
This signal announces that the device is ready for operation.
The serial communication driver makes this signal ON, when
communication channel is successfully opened. If receive
buffer overflows, ER is brought OFF to inform data loss to
external device.
DR : Data set ready [input]
This signal indicates that external device is ready for
operation. Application program can examine the state of this
signal by using status check function, rs_status().