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© Sealevel Systems, Inc.
2101 Manual | SL9089 8/2021
Technical Description
The
232
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
460.8K baud. Refer to Appendix C for cable length limitations.
Features
•
Hot-
Pluggable device that doesn’t require opening the case
•
No system resources are required (i.e., I/O ports or IRQs)
•
LED status indicators for “USB Enabled”, “TD”, and “RD”
Connector Pin Assignments
RS-232 Signals (DB-25 Female)
Signal
Name
Pin #
Mode
TD
Transmit Data
2
Output
RTS
Request To Send
4
Output
DTR
Data Term Ready
20
Output
GND
Ground
7
RD
Receive Data
3
Input
DCD
Data Carrier Detect
8
Input
DSR
Data Set Ready
6
Input
CTS
Clear To Send
5
Input
RI
Ring Indicator
22
Input
These assignments meet EIA/TIA/ANSI-232 DTE specifications for DB-25 type connectors.
