Impulse 2123 - Manual (Page 15)

Electrical Specifications
The 2123 connects to a single USB port and provides a single RS-232/422/485
software configurable serial port. The 2123 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 # Signal
1 DCD
2 RX
3 TX
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
RS-422 & RS-485 Four-Wire (DB9 Male)
Pin # Signal
1 RX+
2 RX-
3 TX-
4 TX+
5 GND
Note: Pins 6-9 are ‘no connect’
RS-485 Two-Wire (DB9 Male)
Pin # Signal
3 DATA-
4 DATA+
5 GND
Note: Pins 1, 2, 6-9 are ‘no connect’
© Sealevel Systems, Inc. - 13 - SeaLINK.SC User Manual