Troubleshooting guide
Control Pins
SHURE
P4800 System Processor Software Guide Page 82 of 108
Binary Encoding
Maximum # of Presets: 128
Number of Pins Required: Refer to the table on the right
Binary encoding equates a binary number with a System Processor
preset number for both control input and logic output. This is the
default encoding type when you enter 9 or more presets in the
[# Presets] value box.
The binary code corresponds to voltage states at the control pins
on the back of the System Processor device.
§ Logic 0 = pin lifted
§ Logic 1 = pin grounded
You can calculate the binary code that the System Processor uses to encode presets by using the
instructions below, or refer to Appendix A: Binary Encoding Tables on page 94 for complete binary
encoding tables for one to seven pins.
To convert the preset number to binary code:
1. Take the preset number and subtract 1.
2. Convert that number to its binary equivalent, observing the following convention:
The most significant bit always corresponds to pin 1, and the least significant bit always corresponds to
the highest pin number among those that are wired for preset control, as illustrated below in figure 56.
Example – Preset #7:
§ 7 – 1 = 6
§ 6 in binary = 110
Note: For accurate preset switching at control input, the binary encoding for any preset
must contain the same number of bits as there are control pins wired for preset
encoding. Add zeros to the left of the binary value until there are the same
number of numerals as there are control pins wired for preset encoding, as
illustrated above in figure 56.
Custom Switch Encoding (Control Input Only)
Maximum # of Presets: 10
Number of Pins Required: 1
Custom switch encoding for control input equates resistor values with preset
numbers one through ten. This type of encoding is only available when you
enter a value of 10 or lower in the [# Presets] value box. Refer to Table 3 in
the Control Pins Connections section of the Hardware Installation guide for
more information on which resistor values equate to preset numbers.
# of Presets # of Pins Required
2 1
4 2
8 3
16 4
32 5
64 6
128 7
Figure 57
−
Custom
Switch Encoding
Fi
g
ure 56
−
Binar
y
Encodin
g
Preset #7 for Three, Four, and Five Pins