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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.

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Impulse 2103 Manuale Utente Pagina 9