NMEA Messages

A proprietary NMEA message format is used to communicate to and from the remote connected devices. The message structure varies slightly for the type of device (Man Down Pendant, Wireless Serial Gateway (WSG), or Engine Vehicle Diagnostic Transmitter (E-VDT), but the format follows the table defined below.

ASCII	Description
$	Start character
ABC or PABC	Message type. Messages starting with P are non-standard proprietary.
<string>,<string>	Message body. Multiple strings are separated with commas.
*	Message terminator
hh	Message checksum
<CR><LF>	Carriage return, line feed