Simplex 4100-0136 Installation Instructions Manual page 6

How the Decoder Works,
Coder Timing and
Rules
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The decoder determines valid timing for a received code based on a minimum pulse duration, and
uses a series of rules to differentiate between the various code elements. These rules are briefly
listed in the following paragraphs.
The scan rate for decoder inputs is 50 mS. The minimum pulse of space recognized is 100 mS, or
two scans.
A code may consist of one to six digits. However, the code is limited in that it must fit on a
16-character line. If a code is six digits in length, at least one digit must consist of only one
character. The largest digit recognized by the decoder is 15. Zero is not a valid digit. In addition,
the following codes must be entered into the decoder as a "single-digit" code.
Actual Code
1-1
1-1-1
1-1-1-1
1-1-1-1-1
1-1-1-1-1-1
The following definitions apply specifically to the decoder.
Code Pulse: A pulse of 100 mS (minimum duration), or one
sounding of the bell.
Pulse Space: A pulse space of 100 mS (minimum duration), or the
pause between soundings.
Code Digit: A code digit consists of 1 to 15 code pulses, separated
by pulse spaces.
Digit Space: The pause between digits.
A single transmission of all code digits
Code Round:
Round Space: The pause between code rounds; greater than the
maximum digit space, but less than 12.5 seconds.
Table 2. Code Conversion
Code Entered in decoder
2
3
4
5
6
6
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