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The OMG-ULTRA-485-PCI provides an additional asynchronous serial port, field selectable as RS-422/485/530
for industrial automation and control applications.
The OMG-ULTRA-485-PCI utilizes the EXAR 16C850 UART. This chip features programmable baud rates, data
format, interrupt control and an industry leading 128 byte FIFOs.
Connector Pin Assignments
RS-422/485/530 Pin Assignments (DB-25 Male DTE)
Signal
GND
RDB
RDA
CTSB
CTSA
TDB
TDA
RTSB
RTSA
Note: These assignments meet the EIA/TIA/ANSI-530 DTE.
OMG-ULTRA-485-PCI
Technical Description
Name
Ground
RX+
Receive Positive
RX-
Receive Negative
CTS+
Clear To Send Positive
CTS-
Clear To Send Negative
TX+
Transmit Positive
TX-
Transmit Negative
RTS+
Request To Send Positive
RTS-
Request To Send Negative
Technical Description
Pin #
Mode
7
16
Input
3
Input
13
Input
5
Input
14
Output
2
Output
19
Output
4
Output
Page 7
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