Technical Description
Sealevel Systems
232
Page
6
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 IRQ’s)
•
LED status indicators for “USB Enabled”, “TD”, and “RD”
Connector Pin Assignments (DB25 Male)
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
Note:
These assignments meet EIA/TIA/ANSI-574 DTE specifications for
DB-25 type connectors.
