ZETRON 4010 - GE-Star Decoder; GE-STAR Overview; GE-STAR Decoder Setup

Option Installation
72 025-9227S
GE-Star Decoder
The ZETRON Model 4010 GE-STAR Decoder is designed to add on to any existing
ZETRON Model 4010 Dual Channel Card. The GE-STAR Decoder can be configured to
interpret one of a number of different GE-STAR formats. The DIP switches 1-4 on the
GE-STAR Decoder board determine the format that will be decoded. Each format uses the
GE-STAR T1, T2, and S1 bits in a different manner and some formats expand the basic
11-bit GE-STAR ID.
GE-STAR Overview
The signaling method used in GE-STAR is phase-shift-keying (PSK). This method uses
400 bps data with a 1600 Hz sub-carrier, resulting in 90 degree phase shifts that indicate a
change in bit status (either 0 to 1 or 1 to 0).
The format of the data is shown below:
-------------------------------------------------
Word 1: | | | | | |11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1|
-------------------------------------------------
^ ^
Sync Bits ID Bits
-------------------------------------------------
Word 2: |T1|T2|S1|S2|S3|S4|M1|M2|M3|M4| | | | | | |
-------------------------------------------------
^^ ^ ^
Tag Status Message Error
Bits Bits Bits Detection Bits
Typically, the GE-STAR information is transmitted in a short burst of three repeated
messages of the above format, preceded by a 16-bit preamble of alternating l’s and 0’s.
The repetitions and error detection on each message provide immunity to falsing and high
decoding reliability.
GE-STAR Decoder Setup
DIP switches 1-4 on the Model 4010 GE-STAR Decoder board determine the format that
will be decoded. The valid settings are summarized below:
Table 23: Multi-System Formats (T1,T2=System Number)
Switches
4321
Description
0000 System 0 Only Decode
0001 System 1 Only Decode
0010 System 2 Only Decode
0011 System 3 Only Decode
0=On (direction of arrow on switch)
1=Off (opposite direction of arrow on switch)