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Electrical Specifications
The 2128 connects to a single USB port and provides one RS-232/422/485 software configurable serial
port. The 2128 utilizes high speed USB/UARTs with 128-byte Tx FIFOs and 384-byte Rx FIFOs. The chips
feature programmable baud rates and data rates to 921.6K bps.
Connector Pinouts
RS-232 (DB9 Male)
Pin #
1
2
3
4
5
6
7
8
9
RS-422 & RS-485 Four-Wire (DB9 Male)
Pin #
1
2
3
4
5
Pins 6-9 are 'no connect'.
© Sealevel Systems, Inc.
2128 Manual | SL9206 6/2021
Signal
DCD
RX
TX
DTR
GND
DSR
RTS
CTS
RI
Signal
RX+
RX-
TX-
TX+
GND
16
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