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Technical Description
The OMG-USB-232-1 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
TD
Transmit Data
RTS
Request To Send
DTR
Data Term Ready
GND
Ground
RD
Receive Data
DCD
Data Carrier Detect
DSR
Data Set Ready
CTS
Clear To Send
RI
Ring Indicator
Note: These assignments meet EIA/TIA/ANSI-574 DTE specifications for DB-25
type connectors.
OMG-USB-232-1
Technical Description
Pin #
Mode
2
Output
4
Output
20
Output
7
3
Input
8
Input
6
Input
5
Input
22
Input
Page 6
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