Technical Description - SeaLevel COMM+8.422.PCIe User Manual

Technical Description

The COMM+8.422.PCIe provides eight RS-422/485 ports from a single PCIe slot.
The COMM+8.422.PCIe utilizes the OXPCIe954 UART. This chip features programmable baud rates, data
format, interrupt control and industry leading 128-byte transmit and receive FIFOs.
The UARTs are register compatible with 16C450, 16C550, 16C654 and 16C750 UARTs. The FIFO depth can
be changed to match the depth of these UARTs.
RS-422/485 (CA-231 DB-9) Connector Pin Assignments
© Sealevel Systems, Inc. 7802e Manual | SL9249 11/2022
Signal Name
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
Pin # Mode
5
4 Output
3 Output
6 Output
7 Output
1 Input
2 Input
9 Input
8 Input
12