Curtis 1238SE - Page 106

10 — VEHICLE CONTROL LANGUAGE (VCL)
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017 Return to TOC
pg. 102
e proportional driver (Driver 5 , Pin 2) is dierent from Drivers 1–4. It can be controlled in two
ways: with the proportional driver processing function (see Figure 17) or with the VCL Put_PWM()
function. e VCL statement Put_PWM(PWM5, 16383) will result in a 50% PWM output on pin 2
only if the parameter PD Enable is set to O. For more information about the proportional driver,
see the section entitled “INTERFACING THE PROPORTIONAL CURRENT DRIVER” on page 109.
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 lled
with the present value of the driver output (On or O ).
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
ese controllers have two potentiometer inputs, which are typically used for throttle and brake.
Many features (mapping, acceleration rates, etc.) are built in as 1313/1314 programmer 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. e standard way to input pot information
is to set the parameter rottle Type (or Brake Type) to an appropriate value of 1–4 as described in
the rottle Type pages, and the rottle and Brake parameter menus. 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 brake) signal chain in VCL or use the throttle
(or brake) inputs for signals that are not throttle (or brake) signals, then the parameter rottle Type
(or Brake Type) should be set to a value of 5. Setting the parameter rottle Type (or Brake Type) to
a value of 5 changes the routing of the appropriate signal chain (either throttle or brake) and allows
the VCL programmer access to the rottle Pot (or Brake Pot) output variables; see Figure 15.
Using the Setup_Pot() function, executed at the beginning of a VCL program, will define the
potentiometer input connection(s) 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 connections are the same as the 3-wire potentiometer connections
shown in Figure 5 for rottle Type 2.
TWO_WIRE potentiometer connections are the same as the 2-wire potentiometer connections
shown in Figure 4 for rottle Type 1.
ONE_WIRE potentiometer connections are the same as the Voltage Source or Current Source
connections shown in Figure 5 for rottle Type 2.
Note that the Setup_Pot() function will only work (and is only needed) if the corresponding Type is
set to 5 (rottle Type = 5 or Brake Type = 5).
Setup_Pot(THROTTLE_POT,THREE_WIRE)
will set up the throttle pot input for wiring using all three connections (pins 15, 16, 18).
To set up the brake pot input for use in VCL, use the Brake_Pot constant in place of the ottle_Pot
constant in the Setup_Pot function.
Setup_Pot(BRAKE_POT,TWO_WIRE)
will set up the brake pot input for wiring using two connections (pins 17, 18).
Quick Links:
rottle Type
Selection p.20–23
ree-Wire p.21
Two-Wire p.20,23
One-Wire p.21
Figure 15 p.105
Figure 17 p.109
rottle menu p.46
Brake menu p.48
Setup_Pot ( ) p.122