Omega OMG-USB-SER-2 - Manual (Page 11)

Technical
OMG-USB-SER-2 Page 8
Technical Description
The OMG-USB-SER-2 utilizes two USB UARTs. These chips feature
programmable baud rate, data format, 128 byte Dual Port TX Buffer, and 384 byte
Dual Port RX Buffer. The RS-232/422/485 transceiver supports data rates up to
921.6K baud for RS-422/485 and up to 460.8K baud for RS-232.
Features
•
Hot pluggable device that does not require opening the case
•
No system resources are required (i.e. I/O ports or IRQ’s)
•
LED status indicators for USB Enabled and port activity
Connector Pin Assignments
RS-422/485 (DB 9 Male)
Signal Name Pin # Mode
GND Ground 5
TX + Transmit Data Positive 4 Output
TX- Transmit Data Negative 3 Output
RTS+ Request To Send Positive 6 Output
RTS- Request To Send Negative 7 Output
RX+ Receive Data Positive 1 Input
RX- Receive Data Negative 2 Input
CTS+ Clear To Send Positive 9 Input
CTS- Clear To Send Negative 8 Input
RS-232 (DB-9 Male)
Signal Name Pin # Mode
GND Ground 5
TX Transmit Data 3 Output
RTS Request To Send 7 Output
DTR Data Terminal Ready 4 Output
RX Receive Data 2 Input
CTS Clear To Send 8 Input
DSR Data Set Ready 6 Input
DCD Data Carrier Detect 1 Input
RI Ring Indicator 9 Input