Zetron 25
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Zetron Model 25 Programmable Encoder

Programming Information

Since I couldn't find the information I needed on other web sites, including Zetron.com, here are some facts that might help someone in programming a Zetron Model 25 Encoder.   This system is often used for Fire Station alerting.  It can be run manually from the keyboard, or more commonly, connected to the CAD (Computer Aided Dispatch) system.  The system can be used for many tone formats.  Ours uses Motorola's two two format.  One second of tone 1, one second of tone 2. 

Their m25 software is NOT required for programming.  If you have a computer with a serial port and any communications program, you're all set.

This in no way should be used as a replacement for the full operations and programming manuals.  But it might be enough to make a minor change, like changing the programming on one button.

bulletA Belkin USB to serial adapter does work.  Unlike some devices, an on-board serial port does not appear to be necessary.
bulletHyperTerminal, which has come with Windows for years, works fine. 
bullet    4800 baud
bullet    8 bits
bullet    1.5 stop bits
bullet    NO parity
bulletAt the back of the main chassis, switch the programming switch to ENABLE
bulletYou DO need a custom cable (sorry)
bullet    Parts are all available from Radio Shack, but you'll need to do some soldering.
bullet    Or you could hack up a DB-9 M-F cable
DB-9 Female   DB-9 Male
PC or USB converter   Zetron serial connector
pin 2 <-------> pin 3
pin 3 <-------> pin 4 (note non-standard)
pin 5 <-------> pin 5
  ,---> pin 7  (7 connects to 9 in the hood)
  '---> pin 9
bulletWhen you're all connected, type a Capital P.
bullet    This should give you a menu
bulletTo understand the button coding, you need to draw out a matrix
bulletEach button is a 4 digit number
bullet    First         always 0  
bullet    Second     the panel number, main=1, second=2...
bullet    Third        row number (left to right, left most=0)
bullet    Fourth      column number (top to bottom, top=0)
bullet        The top left button on the second panel would be 0200
bullet        The bottom right button on the third button would be 0359)
bulletFull size panel
0p00 0p01 0p02 0p03 0p04 0p05 0p06 0p07 0p08 0p09
0p10 0p11 0p12 0p13 0p14 0p15 0p16 0p17 0p18 0p19
0p20 0p21 0p22 0p23 0p24 0p25 0p26 0p27 0p28 0p29
0p30 0p31 0p32 0p33 0p34 0p35 0p36 0p37 0p38 0p39
0p40 0p41 0p42 0p43 0p44 0p45 0p46 0p47 0p48 0p49
0p50 0p51 0p52 0p53 0p54 0p55 0p56 0p57 0p58 0p59
bulletTo change one button, type C
bullet    Type 3 to print the setting for another working button. 
bullet    Figure out the change you need to make
bullet    Type 1 to make the change
bullet    Type 3 to check that the changes stuck
bullet        If not, check the enable/disable switch on the back. Should be enable

Even with the manual, you'll need to spend some time figuring things out.  The manual is set up for keyboard programming.  In theory, it should be easier with the computer, but I think the manual is written too much for keyboard programming.  If you're just adding a button, you'll be fine with the information above.  If you need to set one up from scratch, be ready to spend a day reading the manual.






Except for portions owned by others, Copyright: Ray Vaughan, 2008