RoboteQ AX2550, AX1500 user manual Important warning, Connecting Switches or Devices to Input E

Connecting Sensors and Actuators to Input/Outputs

Important warning:

Overvoltage spikes induced by switching inductive loads, such as solenoids or relays, will destroy the transistor unless a protection diode is used.

Connecting Switches or Devices to Input E

Input E is a general purpose, digital input. This input is only available if no encoder module is present and is active when in the RS232 and Analog modes. In R/C mode, this line is used as the radio channel 3 input.

Input E is a high impedance input with a pull-up resistor built into the controller. Therefore it will report an On state if unconnected, and a simple switch as shown on Figure 24 is nec- essary to activate it.

+5V Out 14

Input E 8

Ground 5

50kOhm

10kOhm

50kOhm Internal Buffer

FIGURE 24. Switch wirings to Input E

The status of Input E can be read in the RS232 mode with the ?i command string. The con- troller will respond with three sets of 2 digit numbers. The status of Input E is contained in the first set of numbers and may be 00 to indicate an Off state, or 01 to indicate an On state.

Remember that InputE is shared with the Analog Input 4. If an analog sensor is connected, the controller will return a Digital value of 0 if the voltage is lower than 0.5V and a value of 1 if higher

Connecting Switches or Devices to Input F

Input F is a general purpose digital input. This input is only active when in the RS232 or

Analog modes. In R/C mode, this line is used as the radio channel 2 input.

When left open, Input F is in an undefined stage. As shown in the figure below, a pull down or pull up resistor must be inserted when used with a single pole switch. The resistor may be omitted when used with a dual pole switch.

56 AX1500 Motor Controller User’s Manual Version 1.9b. June 1, 2007