Analog Inputs
Three types of analog inputs are used. The first two inputs use a 0-5 volt input. The next is a 3-
wire connection for a potentiometer using both Pot High and Pot Low and the third is a 2-wire
potentiometer or rheostat.
Note that in all cases, the VCL code must be written to provide the necessary wiring and
potentiometer fault checking. To accomplish this, the 1310 provides the measured voltage
readings of Pot High and Pot Low connections. Monitoring these values will can indicate if
there is a shorted to B+ or B-. Using the Pot High and Pot Low connections for the potentiometer
or rheostat will also provide a small lower and (when using Pot High) upper bound to the
analog input. Knowing this, proper range checking in VCL can be performed for additional fault
diagnostics.
Encoder and Pulse Inputs.
The 1310 has 2 quadrature encoder inputs. Using A and B channels with a quadrature encoder
allows velocity, position (count) and direction detection. Tyeing the A and B channels together,
as shown on encoder input 2, allows the input to measure a single pulse train. In this
configuration, the 1310 will count up (ENC_Count mode) or measure speed magnitude
(Enc_Velocity mode). In both cases, the ENC2_DIR variable is not valid.
Power for the encoder can be derived form the +5 Volt output and Ground pins found on J4. The
+5 volt output has an output current measurement. VCL can use this value to determine if the
encoder and/or any other sensors are connected and drawing the proper current. This can be
used to provide additional fault diagnostics.
Note: If the encoder inputs are setup in velocity mode, the direction flag will not be accurate
below a low speed threshold. The direction bit may stay in the last direction and may not return
to 0 when the speed is at zero. The VCL code must be written to read the velocity variable and
double check the direction bit in this case.
Analog Outputs
The 2 analog outputs can be used to interface to analog throttle input motor controllers or other
devices, Here, Analog Output 1 is used to control the 1204 Motor Controller throttle input.
Note that most throttle inputs are 0-5 volts while the 1310 can provide up to 10 volts.
Analog Output 2 is being used to drive a Curtis gage (enGage 2 or simple voltmeter). VCL code
can use this output to display a wide range of data, from the state of the battery charge, potion
of the potentiometer wipers or speed of the encoder.
1310 Vehicle Control System Users Manual Release Rev B Page 15 of 51
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