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AX2550 Motor Controller User’s Manual 61
Connecting Switches or Devices to Input F
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 29 is nec-
essary to activate it.
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.
This input is not available on the AX2850 or on the AX2550 with the Encoder Module
installed.
Remember that, in RevB hardware, 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.
50kOhm
50kOhm
+5V Out 14
10kOhm
Internal
Buffer
Input E 8
Ground 5
FIGURE 29. Switch wirings to Input E