Overview
The SIO-102 is a 2-channel Serial RS-232C Input-Output
PC/104-16 Expansion Module with two 16C550 based programmable
Serial Ports that work from +5V only.
Based on the industry norm 16C550 architecture, the SIO-102
is a Stack-Through, 16-bit, PC/104 Board featuring two
completely independent high-speed Serial Ports with on-board
RS-232C Drivers/Receivers that work from +5V only. Featuring
the 16C550's 16-byte FIFOs, each Serial Port is individually
programmable for use at any serial speed between 75bps
and 115,200bps.
Operating from +5V only, the SIO-102 is fully capable
of operating in all modes supported by the 16C550. Each
Channel can be set to generate an Interrupt selectable
by individual Jumpers from any available interrupt in
the system.
Each channel takes only 8 consecutive I/O Address spaces
and the base address of each can be located on any "0"
or "8" boundary within the total I/O Address
Space between 0000H and 07F8H (the I/O addresses shown
in hexadecimal notation):
IO Address Space: 0000H to 0007H up to
and including 07F8H (to 07FFH)
Interrupts: IRQ 3, 4, 5, 6, 7, 9, 10,
11, 12, 14 or 15
The I/O Address Space for each port is set by an on-board
8-position switch according to the Address List attached
hereto. The Interrupt is selected individually for each
Port by on-board Jumpers.
The Default Factory Settings for the two Ports are:
| Port 1: |
I/O Address: |
03E8H (corresponds to the I/O Address
of COM3) |
Interrupt: |
IRQ 15 |
| Port 2: |
I/O Address: |
02E8H (corresponds to the I/O Address of COM4) |
Interrupt: |
IRQ 5 |
Click HERE to get
the Address Switch settings for the Total 000H - 7FFFH
I/O Address Space
Serial Connectors
Each Port can be used with either the on-board
DB-9, Male connector, or with the on-board 2*5 pin Header,
for extended cabling. Note that, as these two connectors
are connected "in parallel", only one of these
should be used per Port. Note also that pin number 10
in the header is connected to +5V, allowing limited power
supply of off-board units like, for instance IPS's TS-110
Serial Touch Screen Controller, through the 10-wire ribbon
cable. Note also that this pin is not available when using
the DB-9 Male serial connector.
Software
There are no drivers needed, as the two ports are based
on the architecture of the Industry Standard Serial Input-Output
chip - the 16C550. Any serial port driver developed for
use with the standard serial ports in the PC will work
with these port, and, as an example, the drivers that
come with all versions of Windows will work optimally
with these ports. The interrupt outputs are high impedance
when not active, allowing full sharing of any attached
interrupt. Note that this will require a software driver
written to allow for such sharing of interrupts!
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