Manual Number: 00750-903-2
Page 10
WINCOMM8/C Manual
Chapter 4: Technical Description
The WINCOMM8/C provides 8 additional serial ports for terminals, modems, printers, etc. The
WINCOMM8/C utilizes the 16C554 UART chip. This chip features programmable baud rate, data
format, interrupt control and a 16-byte FIFO. Also available as an option is the 16C854 UART that
provides a 128-byte FIFO and enhanced clocking features.
Features
·
Eight RS-232 Ports with full modem control signals
·
“PAL” addressing option allowing “Turn Key” configurations
·
Selectable/Sharable Interrupts (IRQs 2/9-7,10,11,12, & 15 )
·
Interrupt status port for Windows™ NT (listed in the NT Hardware compatibility list) and
Green Leaf™ COM: libraries
·
8 DB-9 or DB-25 male connectors provided using the “octopus cable”
Interrupt Status Port
The WINCOMM8/C provides the user with an
I
nterrupt
S
tatus
P
ort
(ISP) for greater throughput
when servicing multiple ports on a single interrupt line. The ISP
is a read only 8-bit register that sets
a corresponding bit when an interrupt is pending. Port 1 interrupt line corresponds with Bit D0 of the
status port, Port 2 with D1, etc.
The ISP can be addressed two different ways. If header E11 is in the “Switch” position the Status
Register is located at Base+7 on each port (Example: Base = 280 Hex, Status Port = 287, 28F…
etc.). This allows any one of eight locations to be read to obtain the value in the status register. All
eight status ports on the
WINCOMM8/C
are identical, so any one of the eight can be read. If
header E11 is in the “PAL” position, the status port can be addressed at any location. Please contact
Technical Support for information on PAL programming and custom configurations.
Example: This indicates that Channel 2 has an interrupt pending.
:
n
o
i
t
i
s
o
P
t
i
B
7 6 5 4 3 2 1 0
:
d
a
e
R
e
u
l
a
V
0 0 0 0 0 0 1 0
