Item Description

Auto-Kall Model AK-424 Two-Tone Sequential and Single Tone Decoder

The AK-424 is a tone decoder capable of controlling 4 relays with either single tones or two-tone sequential signaling. Tones are completely user settable from260-3500hz. Minimum tone lengths can be 0.1 to 9.9 seconds per tone. This offers complete versatility to allow the use of any tone, tone pair or tone length regardless of whether it is standard or not-standard.

There is a 5th tone pair used as a cancel command which will turn off all relays. Each relay can be programmed to either latch or stay on for 1-255 seconds. There is a wait command which can also be programmed for 1-255 seconds and a repeat command that will cause the on/wait sequence to be repeated from 0-255 times as set by the user. This allows the AK-424 to be the heart of a two-tone warning siren controller.

A 9 pin D connector is used for the radio interface with the same pin-out used on the Maxon/Midland SD125E and HLD-100 data radios so that a standard straight through 9 pin male/female cable can be used. However, the generic radio interface can also be used with most any communications radio.

Programming is via RS-232 and is accomplished using a standard terminal program such as HyperTerminal allowing the user to set the tone, tone length, bandwidth and timing parameters.