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CHAPTER 6 PIN FUNCTIONS
127
6.1.5 RS-232-C Interface Signals
The RS-232-C interface signals control data transfer between the V
R
4101 and the RS-232-C controller.
Table 6-5 lists the functions of these signals.
Table 6-5. RS-232-C Interface Signals
Signal name
I/O
Definition
Function
RxD*
I
Receive Data
Send data signal. This signal is used when serial data is transferred
from the V
R
4101 to the RS-232-C driver/receiver.
TxD*
O
Transmit Data
Receive data signal. This signal is used when serial data is
transferred from the RS-232-C driver/receiver to the V
R
4101.
RTS*
O
Request to Send
Send request signal. The V
R
4101 asserts this signal to send serial
data.
CTS*
I
Clear to Send
Send enable signal. The RS-232-C driver/receiver asserts this signal
while the controller can accept transferred serial data.
DCD
I
Data Carrier
Detection
Carrier detection signal. This signal is asserted while valid serial data
is being received.
DTR*
O
Data Terminal Ready Terminal ready signal. The V
R
4101 asserts this signal while the
VR4101 can both send and receive serial data.
DSR*
I
Data Set Ready
Data set ready signal. Assert this signal when the RS-232-C
driver/receiver can transfer serial data to and from the V
R
4101.
6.1.6 IrDA Interface Signals
The IrDA interface signals control the transfer of data between the V
R
4101 and IrDA controller. Table 6-
6 lists the functions of these signals.
Table 6-6. IrDA Interface Signals
Signal name
I/O
Definition
Function
IRDIN*
I
IrDA Data In
IrDA serial data input signal. This signal is used to transfer data from
the V
R
4101 to the IrDA controller.
IRDOUT
O
IrDA Data Out
IrDA serial data output signal. This signal is used to transfer data from
the IrDA controller to the V
R
4101.