VT82C686B
Serial Ports and Infrared Interface
Signal Name
Pin #
I/O
Signal Description
A11
D10
E12
O
O
O
Serial port 1 transmit data out.
Serial port 2 transmit data out.
TXD1
TXD2
IRTX
Transmit Data 1.
Transmit Data 2.
Infrared Transmit.
/ GPO14
IR transmit data out (Rx76[5] = 0) from serial port 2.
General Purpose Output 14 if Rx76[5] = 1
B12
B10
D12
I
I
IO
Serial port 1 receive data in.
Receive Data 1.
Serial port 2 receive data in.
Receive Data 2.
IR receive data in (Rx76[5] = 0) to serial port 2. General
Infrared Receive.
RXD1
RXD2
IRRX
/ GPO15
Purpose Output 15 if Rx76[5] = 1
B11
E10
C11
A9
O
O
I
Indicator that serial output port 1 is ready to transmit data.
Request To Send 1.
Typically used as hardware handshake with CTS1# for low level flow control.
Designed for direct input to external RS-232C driver.
Indicator that serial output port 2 is ready to transmit data.
Request To Send 2.
Typically used as hardware handshake with CTS2# for low level flow control.
Designed for direct input to external RS-232C driver.
RTS1#
RTS2##
CTS1#
CTS2#
Indicator to serial port 1 that external communications device is
Clear To Send 1.
ready to receive data. Typically used as hardware handshake with RTS1# for low
level flow control. Designed for input from external RS-232C receiver.
I
Indicator to serial port 2 that external communications device is
Clear To Send 2.
ready to receive data. Typically used as hardware handshake with RTS2# for low
level flow control. Designed for input from external RS-232C receiver.
D11
B9
O
O
I
Serial port 1 indicator that port is powered, initialized,
Data Terminal Ready 1.
and ready. Typically used as hardware handshake with DSR1# for overall
readiness to communicate. Designed for direct input to external RS-232C driver.
DTR1#
DTR2#
DSR1#
Serial port 2 indicator that port is powered, initialized,
Data Terminal Ready 2.
and ready. Typically used as hardware handshake with DSR2# for overall
readiness to communicate. Designed for direct input to external RS-232C driver.
C12
Indicator to serial port 1 that external serial communications
Data Set Ready 1.
device is powered, initialized, and ready. Typically used as hardware handshake
with DTR1# for overall readiness to communicate. Designed for direct input from
external RS-232C receiver.
C10
I
Indicator to serial port 2 that external serial communications
Data Set Ready 2.
DSR2#
device is powered, initialized, and ready. Typically used as hardware handshake
with DTR2# for overall readiness to communicate. Designed for direct input from
external RS-232C receiver.
A12
A10
E11
C9
I
I
I
I
Indicator to serial port 1 that external modem is detecting
Data Carrier Detect 1.
DCD1#
DCD2#
RI1#
a carrier signal (i.e., a communications channel is currently open). In direct
connect environments, this input will typically be driven by DTR1# as part of the
DTR/DSR handshake. Designed for direct input from external RS-232C receiver.
Indicator to serial port 2 that external modem is detecting
Data Carrier Detect 2.
a carrier signal (i.e., a communications channel is currently open). In direct
connect environments, this input will typically be driven by DTR2# as part of the
DTR/DSR handshake. Designed for direct input from external RS-232C receiver.
Indicator to serial port 1 that external modem is detecting a
Ring Indicator 1.
ring condition. Used by software to initiate operations to answer and open the
communications channel. Designed for direct input from external RS-232C
receiver (whose input is typically not connected in direct connect environments).
Indicator to serial port 2 that external modem is detecting a
Ring Indicator 2.
RI2#
ring condition. Used by software to initiate operations to answer and open the
communications channel. Designed for direct input from external RS-232C
receiver (whose input is typically not connected in direct connect environments).
Revision 1.71 June 9, 2000
-17-
Pinouts
ETC [ ETC ]
