Instruction Manual

Technical Description
Sealevel Systems SeaLINK+485I Page 8
Technical Description
The SeaLINK+485I: 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-422/485 transceiver supports data rates up to 921.6K baud.
Features
• Hot-Pluggable device
• 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)
The SeaLINK+485I complies with the EIA-530 pin out with the following
signals supported
Signal Name Pin # Mode
GND Ground 7
RDB RX+ Receive Positive 16 Input
RDA RX- Receive Negative 3 Input
TDB TX+ Transmit Positive 14 Output
TDA TX- Transmit Negative 2 Output
Technical Note: The modem control signals are biased as follows : RTS is
connected to CTS, DTR is connected to DCD and DSR, and RI is tied
inactive.