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The Sealevel Systems ULTRA COMM+I.LPCI provides a PCI interface adapter with an isolated asynchronous
serial port providing a versatile interface, field selectable as RS-232 for modems, printers and plotters, as well as
RS-422/485 for industrial automation and control applications. 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 phenomenon that leads to data loss and the destruction of
communications interfaces.
The ULTRA COMM+I.LPCI utilizes the 16C850 UART. This chip features programmable baud rates, data
format, interrupt control and industry leading 128-byte FIFOs.
Connector Pin Assignments
RS-232 Signals (DB-25 Male)
Signal
GND
RD
CTS
TD
RTS
Technical Note: Please terminate any control signals that are not going to be used. The most common way to do this
is connect RTS to CTS. Terminating these pins, if not used, will help insure you get the best performance from your
adapter.
RS-422/485/530 Pin Assignments (DB-25 Male)
Signal
GND
RDB
RDA
CTSB
CTSA
TDB
TDA
RTSB
RTSA
Sealevel Systems ULTRA COMM+I.LPCI
Technical Description
Name
Ground
Receive Data
Clear To Send
Transmit Data
Request to Send
Name
Ground
RX+
Receive Data Positive
RX-
Receive Data Negative
CTS+
Clear To Send Positive
CTS-
Clear To Send Negative
TX+
Transmit Data Positive
TX-
Transmit Data Negative
RTS+
Request To Send Positive
RTS-
Request To Send Negative
Technical Description
Pin #
Mode
7
3
Input
5
Input
2
Output
4
Output
Pin #
Mode
7
16
Input
3
Input
13
Input
5
Input
14
Output
2
Output
19
Output
4
Output
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