Curtis 1298 User Manual

90
Curtis 1298 Manual, OS 11
Control of the two digital outputs (Digital Outputs 6 and 7) is done
using the VCL functions Set_Digout() and Clear_Digout().
Set_DigOut(DigOut6)
will set Digital Output 6 On (active). VCL can monitor the present value of
a digital output driver: the bit variable Digx_Output (where “x” is the digital
output channel number) is automatically filled with the present value of the
driver output (On or Off).
It is important to note that all outputs are active Low. With 100% PWM
or an output of “On,” the FET or transistor will be pulling hard to ground. A
DVM on the output will measure near 0 volts.
Potentiometer Inputs
The 1298 controller has two potentiometer inputs, which are typically used
for a traction motor throttle and a pump motor throttle. Many features (map
-
ping, acceleration rates, etc.) are built in as 1311 parameters. Still, there are
times that these potentiometer inputs may be needed for other functions such
as steering angle or height sensing, or simply as data inputs.
The standard way to input pot information is to set the 1311 parameter
Throttle Type (or Hyd Throttle Type) to an appropriate value of 1–4 as shown
on pages 11–14. When set to a value of 1–4, the resulting signal chain can
operate without the use of any VCL.
However, if an OEM wishes to control the throttle (or hydraulic throttle)
signal chain in VCL or use either of the throttle inputs for signals that are
not throttle signals, then the 1311 parameter Throttle Type (or Hyd Throttle
Type) should be set to a value of 5. Setting the 1311 parameter Throttle Type
(or Hyd Throttle Type) to a value of 5 changes the routing of the appropriate
signal chain (drive throttle or hydraulic throttle) and allows the VCL program
-
mer access to the Throttle_Pot_Output or Brake_Pot_Output variables; see
Figure 17, page 93. (Note that in VCL, the hydraulic throttle output is named
Brake_Pot_Output.)
When the Throttle Type = 5, the Throttle_Pot_Output is a VCL variable
that the OS will update with the current value of the throttle pot input. Similarly,
when the Hyd Throttle Type = 5, the Brake_Pot_Output is a VCL variable that
the OS will update with the current value of the hydraulic throttle pot input.
However, the value of the Throttle_Pot_Output (or Brake_Pot_Output) will
remain clamped to zero until the VCL function Setup_Pot() is executed.
Typically the Setup_Pot() function is executed at the beginning of a VCL
program to define the potentiometer input connection as
THREE_WIRE (uses Pot
High and Pot Low connections),
TWO_WIRE (variable resistor, or rheostat, uses
Pot Low but no connection to Pot High), or
ONE_WIRE (a voltage input, no
connection to either Pot High or Pot Low).
THREE_WIRE potentiometer con-
nections are the same as the 3-wire potentiometer connections shown on page 13
for a Throttle Type 2.
TWO_WIRE potentiometer connections are the same as
the 2-wire potentiometer connections shown on page 12 for a Throttle Type 1.
ONE_WIRE potentiometer connections are the same as the Voltage Source or
Current Source connections shown on page 13 for a Throttle Type 2.
7 — VCL

Curtis 1298 Specifications

General

Brand	Curtis
Model	1298
Category	Controller
Language	English