Impulse 2103 - Manual (Page 9)

Technical Description
Sealevel Systems SeaLINK+232I Page 6
Technical Description
The SeaLINK+232I 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 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”, “TD”, and “RD”
Connector Pin Assignments (DB25 Male)
Name Pin # Mode
TD Transmit Data 2 Output
RD Receive Data 3 Input
RTS Request To Send 4 Output
CTS Clear To Send 5 Input
GND Ground 7
Note: These assignments meet EIA/TIA/ANSI-574 DTE specifications for
DB-25 type connectors.
Technical Note: The remaining modem control signals are biased in the
following fashion: DTR is connected to DCD and DSR, and RI is tied
inactive.