Omega RS-232 Technical Description, Features, Connector Pin Assignments DB25 Male, Name, Pin #

Technical Description

Technical Description

The OMG-USB-232-1utilizes 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.

OMG-USB-232-1 Page 6