Ampro Corporation XTX 820 - Manual (Page 44)

Chapter 3 Hardware
38 Reference Manual XTX 820
J3
Pin # Pin #
DB9 Signal Description
75 8 CTS2* Clear To Send 2 – Indicates external serial device is ready to receive data.
Used as hardware handshake with RTS2 for low level flow control.
69 4 DTR2* Data Terminal Ready 2 – Indicates Serial port 1 is powered, initialized, and
ready. Used as hardware handshake with DSR2 for overall readiness.
79 9 RI2* Ring Indicator 2 – Indicates external serial device is detecting a ring
condition. Used by software to initiate operations to answer and open the
communications channel.
19 5 GND Ground
20 NC NC Not connected
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
Infrared (IrDA) Port
The Infrared Data Association (IrDA) port provides a two-way wireless communications port using
infrared as a transmission medium at the basic level. There are two basic infrared implementations
provided; the Hewlett-Packard Serial Infrared (HPSIR) and the Amplitude Shift Keyed Infrared
(ASKIR) methods. HPSIR is a serial implementation of infrared developed by Hewlett-Packard. The
IrDA (HPSIR and ASKIR) signals share Serial Port 2 with the modem and RS232 functions on the port.
This port can be enabled/disabled and configured for HPSIR or ASKIR signals in the BIOS Setup
Utility. Refer to Chapter 4, BIOS Setup Utility for more information.
The HPSIR method allows serial communication at baud rates up to 115k baud. Each word is sent
serially beginning with a zero value start bit. A zero is sent when a single infrared pulse is sent at the
beginning of the serial bit time. A one is sent when no infrared pulse is sent during the bit time.
The Amplitude Shift Keyed infrared (ASKIR) allows serial communication at baud rates up to 19.2k
baud. Each word is sent serially beginning with a zero value start bit. A zero is sent when a 500 kHz
waveform is sent for the duration of the serial bit time. A one is sent when no transmission is sent
during the serial bit time.
Both of these methods require an understanding of the timing diagrams provided in the Super I/O
controller chip (W83627HG) specifications available from the manufacture’s web site and referenced
earlier in this manual. For more information, refer to the Winbond Electronics, Corp. chip specifications
and the Infrared Data Association web site at
http://www.irda.org .
NOTE For infrared applications not covered in this brief description, refer to the
83627HG chip specifications by Winbond Electronics, Corp.
PS/2 Keyboard
The signal lines for a PS/2 keyboard are provided through the J3 connector from the Super I/O
(W83627HG). Refer to Table 3-19 for the Simplified PS/2 Keyboard Pin/Signal Descriptions.
PS/2 Mouse
The signal lines for a PS/2 mouse are provided through the J3 connector from the Super I/O
(W83627HG). Refer to Table 3-19 for the Simplified PS/2 Mouse Pin/Signal Descriptions.