VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 
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Page 23/128:

Serial Ports and Infrared Interface

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Signal Name
Pin #
A11
TXD1
D10
TXD2
IRTX / GPO14
E12
B12
RXD1
B10
RXD2
IRRX / GPO15
D12
RTS1#
B11
E10
RTS2##
CTS1#
C11
A9
CTS2#
D11
DTR1#
DTR2#
B9
C12
DSR1#
DSR2#
C10
A12
DCD1#
A10
DCD2#
E11
RI1#
RI2#
C9
Revision 1.71 June 9, 2000

Serial Ports and Infrared Interface

I/O
Signal Description
O
Transmit Data 1. Serial port 1 transmit data out.
O
Transmit Data 2. Serial port 2 transmit data out.
O
Infrared Transmit. IR transmit data out (Rx76[5] = 0) from serial port 2.
General Purpose Output 14 if Rx76[5] = 1
I
Receive Data 1. Serial port 1 receive data in.
I
Receive Data 2. Serial port 2 receive data in.
IO
Infrared Receive. IR receive data in (Rx76[5] = 0) to serial port 2. General
Purpose Output 15 if Rx76[5] = 1
O
Request To Send 1. Indicator that serial output port 1 is ready to transmit data.
Typically used as hardware handshake with CTS1# for low level flow control.
Designed for direct input to external RS-232C driver.
O
Request To Send 2. Indicator that serial output port 2 is ready to transmit data.
Typically used as hardware handshake with CTS2# for low level flow control.
Designed for direct input to external RS-232C driver.
I
Clear To Send 1. Indicator to serial port 1 that external communications device is
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
Clear To Send 2. Indicator to serial port 2 that external communications device is
ready to receive data. Typically used as hardware handshake with RTS2# for low
level flow control. Designed for input from external RS-232C receiver.
O
Data Terminal Ready 1. Serial port 1 indicator that port is powered, initialized,
and ready.
Typically used as hardware handshake with DSR1# for overall
readiness to communicate. Designed for direct input to external RS-232C driver.
O
Data Terminal Ready 2. Serial port 2 indicator that port is powered, initialized,
and ready.
Typically used as hardware handshake with DSR2# for overall
readiness to communicate. Designed for direct input to external RS-232C driver.
I
Data Set Ready 1. Indicator to serial port 1 that external serial communications
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.
I
Data Set Ready 2. Indicator to serial port 2 that external serial communications
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.
I
Data Carrier Detect 1. Indicator to serial port 1 that external modem is detecting
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.
I
Data Carrier Detect 2. Indicator to serial port 2 that external modem is detecting
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.
I
Ring Indicator 1. Indicator to serial port 1 that external modem is detecting a
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).
I
Ring Indicator 2. Indicator to serial port 2 that external modem is detecting a
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).
-17-
VT82C686B
Pinouts