Impulse 7205e - Manual (Page 21)

Electrical Specifications
Each serial port utilizes a 16C950 UART featuring programmable baud rates, data
format, interrupt control and industry-leading 128-byte transmit and receive FIFOs.
This high-performance UART includes 9-bit framing support and is fully software
compatible with legacy 16550 applications. In addition, the 14.7456 oscillator and
UART’s flexible clock prescaler supports the widest range of standard and non-
standard baud rates to 921.6K bps. Refer to Appendix C for cable length limitations.
Connector Pin Assignments
Board Connector (DB25 Male)
The 7205e board includes a DB25 male connector for attaching the included cable
(Item# CA203). The pin out for the DB25M connector is shown in the table below.
Port 1 Pin# Port 2 Pin# RS-232 RS-422/485
1 11 RD RD –
2 12 CTS CTS –
3 13 DCD RD +
4 14 TD TD –
5 15 RTS RTS –
6 16 DSR RTS +
7 17 DTR TD +
8 18 RI CTS +
9 10 GND GND
© Sealevel Systems, Inc. - 19 - COMM+2.LPCIe User Manual