Zetron Model 25 Programmable Encoder
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.
|A Belkin USB to serial adapter does work. Unlike some devices, an
on-board serial port does not appear to be necessary.|
|HyperTerminal, which has come with Windows for years, works fine.
| 4800 baud|
| 8 bits|
| 1.5 stop bits|
| NO parity|
|At the back of the main chassis, switch the programming switch to ENABLE|
|You DO need a custom cable (sorry)|
| Parts are all available from Radio Shack, but you'll
need to do some soldering.|
| Or you could hack up a DB-9 M-F cable|
|PC or USB converter
||Zetron serial connector
||pin 4 (note non-standard)
||pin 7 (7 connects to 9 in the hood)
|When you're all connected, type a Capital P.|
| This should give you a menu|
|To understand the button coding, you need to draw out a matrix|
|Each button is a 4 digit number|
always 0 |
| Second the panel number,
| Third row
number (left to right, left most=0)|
| Fourth column number (top
to bottom, top=0)|
| The top left button on the
second panel would be 0200|
| The bottom right button on the
third button would be 0359)|
|Full size panel|
|To change one button, type C|
| Type 3 to print the setting for another working button.
| Figure out the change you need to make|
| Type 1 to make the change|
| Type 3 to check that the changes stuck|
| 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.