Table of Contents
Advertisement
Technical Description
The OMG-ULTRA-SIO provides the PC with two additional ground isolated RS-
422/485 (P/N 3189) or two non-isolated RS-422/485 (P/N 3089) serial ports for
terminals, modems, printers, etc. Isolation is important in installations where the
equipment being connected to the PC is either far from the PC, or on a different
power transformer circuit. Ground loop current is a commonly neglected and
misunderstood phenomena that leads to data loss and the destruction o f
communications interfaces. The OMG-ULTRA-SIO isolated boards provide up
to 500 volts DC of isolation.
The OMG-ULTRA-SIO utilizes the 16550 UART. This chip features
programmable baud rate, data format, interrupt control and a 16 byte input and
output FIFO. A full array of UART upgrades is also available offering larger
FIFO's. Contact technical support for details.
Features
Automatic RS-485 driver enable/disable allows card to appear to be RS-232
requiring no additional drivers
'PAL' option allows for unique OEM address selection
'Shareable' IRQs allow more than one port to share a single IRQ providing a
polling type driver is used.
IRQs 2/9-7, 10, 11, 12, 14, 15 supported
16550 buffered UARTs Standard
16 Bit address decode allows for easier integration
Connector Pin Assignments (DB 9 MALE)
Signal
GND
Ground
TX +
Transmit Data Positive
TX-
Transmit Data Negative
RTS+
Request To Send Positive
RTS-
Request To Send Negative
RX+
Receive Data Positive
RX-
Receive Data Negative
CTS+
Clear To Send Positive
CTS-
Clear To Send Negative
OMG-ULTRA-SIO
Technical Description
Name
Pin #
5
4
3
6
7
1
2
9
8
Mode
Output
Output
Output
Output
Input
Input
Input
Input
Page 10
Advertisement
Table of Contents
