7
Indicators
The MiniPlex-41USB has two LED’s. The green LED indicates the reception of valid NMEA data on
the listener ports or the USB port. The LED only blinks on valid NMEA sentences that start with a ‘$’
or ‘!’ and end with a LF character, thus indicating a proper connection and polarity of the
connected instrument. In case of a reverse polarity, the green LED will not blink.
The red LED indicates a buffer overflow, in case more data is coming in than can be transmitted.
When a buffer is full, a partially received sentence will be discarded, to ensure that the MiniPlex-
41USB only passes complete and valid sentences.
There are three ways to resolve this overflow situation:
1. Configure the instruments on the listener ports to send less data or with greater intervals.
It is often possible to disable non-relevant sentences.
2. Increase the speed of the talker port and the USB port on the MiniPlex-41USB. The
maximum speed is 38400 Baud. From 19200 Baud and up (4 x 4800!) an overflow will
never occur (except when in Hub Mode).
Both LED’s will blink once when the power is applied to the MiniPlex-41USB. When the red LED
stays lit, a hardware error is found during execution of the self-test.
Mounting
The MiniPlex-41USB is not waterproof. It should be mounted at a dry place, like behind the
instrument panel, on a flat surface.
