Impulse 2803 - Manual (Page 7)

Configuration
Sealevel Systems SeaLINK+8 Page 5
Configuration
Factory configuration
Each device ships from Sealevel Systems with the following configuration.
Model 2801 – SeaLINK+8/232 USB to RS-232 Converter
Contains no user configurable components.
Model 2802 – SeaLINK+8/485 USB to RS-422/485 Converter
RS-422 4-wire full duplex mode selected.
Transmitter always enabled.
Receiver always enabled and terminated and biased as follows:
120ohm terminator between RX+ and RX-
1Kohm pull-up on RX+
1Kohm pull-down on RX-
Model 2803 – SeaLINK+8 USB to RS-232/422/485 Converter
RS-422 4-wire full duplex mode selected.
Transmitter always enabled.
Receiver always enabled and terminated and biased as follows:
120ohm terminator between RX+ and RX-
1Kohm pull-up on RX+
1Kohm pull-down on RX-
In order to change the configuration the box must be opened. Do this by
removing the four screws that attach the two halves of the box.
Electrical Interface Selection
Each port of the SeaLINK+8 models 2802 and 2803 can be individually
configured for the specific electrical interface. Model 2802 supports
RS-422/485 while Model 2803 supports RS-232/422/485. This is selectable via
the dipswitch associated with each port. Each of the switch positions is
described on the following page.