DMR-PD-006 · Digital message repeater for fire, security and life safety systems

Messages and memory

The DMR-PD-006 plays one to six messages of digitized audio stored in up to four on-board EPROMs. Mackenzie’s Vocalizer circuitry converts the stored voice data into an audio message, a high quality, life-like reproduction of the actual speaker’s voice. The messages are digitized at the factory from customer supplied audio recordings or scripts; they may be of different lengths, but their total cannot exceed the capacity of the unit.

• DMR-ME6-73: 7.5 seconds, 1 EPROM.
• DMR-ME6-153: 15.0 seconds, 2 EPROMs.
• DMR-ME6-223: 22.5 seconds, 3 EPROMs.
• DMR-ME6-303: 30.0 seconds, 4 EPROMs.
• Bandwidth 50 Hz to 3.4 kHz, 7.5 seconds per EPROM; the memory is non-volatile.
• Message EPROMs are ordered separately and come in carriers that make field insertion simple and damage proof. They are not interchangeable with any other type of DMR-PD EPROM messages.
• The built-in test message, “This is an audio system test”, is stored in the program EPROM.

Connections

The unit has two connectors. J1 is a 12-position plug-in terminal strip for power, audio, control commands and relays; J2 is a 20-position double-row contact housing with a factory-assembled pigtail for the control inputs. All inputs are optically coupled, and each command is a contact closure to 0 V from a dry contact or an open collector TTL output. Power is an external 24 VDC at 250 mA nominal, 300 mA peak. The enclosure measures 7.100 × 6.125 × 1.800 inches.

• J1-1, J1-2: audio out, 600 Ω transformer isolated line level, factory preset to −5 dBm (0 dB peak).
• J1-3, J1-4: audio sense input (10 kΩ). Most applications need no input here; only special applications route the output back to it, and then the internal audio sense jumpers must be removed.
• J1-5, J1-6: 24 VDC, + and −.
• J1-7, J1-8, J1-9: Start 1, Stop/Reset and Test inputs, also available on J2.
• J1-10, J1-11, J1-12: Play relay (normally open, closes while playing), Error relay (closed in normal operation, opens on failure) and relay common; dry contacts rated 0.75 A at 24 VDC, non-inductive load.
• J2 pin 4 (black): 0 V, the common for all commands.
• J2 pins 1 (blue), 7 (brown), 9 (slate), 11 (yellow), 13 (violet), 15 (white): Start 1 to Start 6.
• J2 pin 3 (orange): Stop; pin 5 (green): Test.

Control commands

• Start (six inputs, random access): a momentary closure of at least 250 ms plays the message. Further commands are stored first-in, first-out (FIFO) and played in order after the current one. A latched closure repeats the message until it is removed.
• Stop/Reset: a momentary closure of at least 250 ms stops the playing message and aborts every message in the FIFO; active inputs must then be reactivated. It also resets the ERROR/FAIL relay.
• Test: held for at least 250 ms before the Start 1 command, it plays the built-in test message, to check the entire public address system or the unit’s ERROR/FAIL function. Hold Test until the playing cycle is complete, or the ERROR/FAIL relay will report a malfunction.
• Playing: the PLAYING contact closes while the test message or an audio message plays and stays closed through the repeats and pauses, opening only when the play sequence is complete.

Setup switch SW1

All options are set on the 8-position DIP switch SW1. The unit plays and then pauses, and there is always a pause between plays. Example, 3 plays with a 5 second pause on a maintained closure; play, 5 s, play, 5 s, play, then the sequence starts again.

• S1, S2, message repeats: off/off 1 play, off/on 2 plays, on/off 3 plays, on/on 4 plays per command.
• S3, S4, S5, pause between plays: off/off/off 1 s, off/off/on 3 s, off/on/off 5 s, off/on/on 7 s, on/off/off 10 s, on/off/on 15 s, on/on/off 20 s, on/on/on 30 s.
• S6 on: VoiceCheck disabled.
• S7 on: auto test disabled.
• S8 on: after an error the unit resets itself after one minute. S8 off: the ERROR/FAIL indication stays until a Stop/Reset command.

Supervision and self-test

The DMR-PD-006 tests itself about once a minute, checking the microprocessor, the program and audio memory and, through the VoiceCheck circuitry, the audio circuits. The ERROR/FAIL relay (form A, dry contact) stays closed while power is present, the microprocessor works, the audio memory is in place and able to provide an intelligible message and the audio circuits work; if any of these fails, its contacts open.

• To return the ERROR/FAIL relay to normal (closed), give a momentary Stop command, use the automatic restart (S8) or press the Reset pushbutton.
• After a software failure, reset the unit with the Reset pushbutton on its side.