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Please Note: Updated Monday, May 26, 2020 We are open for business as usual. Well, mostly usual. We hold and ship inventory locally as well as directly from manufacturers and from some marine distributors. We are doing our best to reflect inventory that is actually available, but inventory updates are slower than usual due to the changing work situations for all business. Additionally, we now have started to see longer than normal backorders from manufacturers. We recommend that if you need a product not to wait until the last minute to order, as inventory may be gone for a substantial period of time once they go on backorder. International orders may also take longer than normal to ship.
The DX28 Expander is a 2-channel signal splitter/amplifier for NMEA 0183 data signal distribution. It can be configured as one 1-in x 8-out expander, two 1-in x 4-out expanders, or an auto-switching expander. The two inputs are completely independent and can operate at the same or different baud rates up to 38,400. The selectable Auto-switching feature enables automatic switchover to the AUXILIARY input when signal is lost from the PRIMARY input. A bicolor (green/red) status LED on each input shows data activity and a third LED (yellow) provides “overcurrent” fault indication
Each input drives four independent RS-422 outputs. The inputs use differential detectors, which are isolated from Power and Ground. The outputs are independent so that shorting one output does not affect the others. The two channels (PRIMARY & AUXILIARY) are identical and completely independent of each other except in “Autoswitch” mode. For a single 8-way expander, the two inputs are strapped together. In "Autoswitch" mode a loss of PRIMARY data for 3 seconds automatically switches to the AUXILIARY input. When the PRIMARY signal returns, the DX28 immediately switches back to it.