Electrical Specifications
The 232-DB9 utilizes a USB UART. This chip features programmable
baud rate, data format, 128-byte dual-port TX buffer, and 384-byte dual-port RX
buffer. The RS-232 transceiver supports data rates up to 921.6K baud. Refer to
Appendix C for cable length limitations.
Connector Pin Out
RS-232 (DB9 Male)
Pin # Signal Name
Mode
1 DCD
Data
Carrier
Detect Input
2 RD
Receive
Data
Input
3 TD
Transmit
Data
Output
4
DTR
Data Terminal Ready
Output
5 GND
Ground
6
DSR
Data Set Ready
Input
7
RTS
Request To Send
Output
8
CTS Clear To Send
Input
9 RI
Ring
Indicator
Input
Note:
These assignments meet EIA/TIA/ANSI-574 DTE specifications for DB-9 type
connectors. Please terminate any control signals that are not going to be used. The most
common way to do this is connect RTS to CTS and RI. Also, connect DCD to DTR and
DSR. Terminating these pins, if not used, will help ensure you get the best performance
from your adapter.
© Sealevel Systems, Inc.
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232-DB9 User Manual
