Product Documentation

3, Mode 3 is similar to Mode 2, except that the speed values are interpreted as signed values.
Data is in the range of -128 (Full Reverse) 0 (Stop) 127 (Full Forward)
GET VI
This command instructs the MD49 to send the battery volts reading (25 = 25v), then the current being
drawn by motor 1 (roughly 1 count per 100mA) and finally the current being drawn by motor 2.
GET ERROR
In the event of and error the red LED will be lit and a byte which contains the type of error that the
MD49 is experiencing will have the appropriate bit set. The bits are:
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
UNDER
16V
OVER 30V
MOTOR 2
SHORT
MOTOR 1
SHORT
MOTOR 2
TRIP
MOTOR 1
TRIP
- -
bit 7 - UNDER 16V stops power being switched to the motor when the source has dropped below the
16V lower threshold. When the supply gets back to 18V the error will clear and power will be
outputted again.
bit 6 - OVER 30V lockout prevents excess voltage being outputted to the motor, the error will be
cleared and power outputted when the supply lowers to 28V or below.
bit 5 - MOTOR 2 SHORT indicates a direct short has been detected across motor 2 output. This error
will remain until power has been cycled.
bit 4 - MOTOR 1 SHORT indicates a direct short has been detected across motor 1 output. This error
will remain until power has been cycled.
bit 3 - MOTOR 2 TRIP is set when the current drawn by motor 2 is greater than 10A. This error will
remain until power has been cycled.
bit 2 - MOTOR 1 TRIP is set when the current drawn by motor 1 is greater than 10A. This error will
remain until power has been cycled.