---
title: "Radionics D1256 and D1257 System Annunciators"
url: https://alsuprun.com/blog/radionics/radionics-d1256-and-d1257-system-annunciators/
author: "Editorial"
date: 2025-11-10T05:35:58+00:00
categories: ["radionics"]
tags: []
---

# Radionics D1256 and D1257 System Annunciators

[Radionics](https://alsuprun.com/)‘ D1256 and D1257 system annunciators are four-wire serial devices designed to work with its D9124 Addressable 24 VDC Fire Command Center as well as D9412, D7212, and D7412 Control/Communicators. They feature highly visible blue vacuum fluorescent displays which display alarms or troubles of system alarms/troubles easily – they’re easy to install, test, and maintain using all procedures outlined by Installation Guides, NFPA 72, Local Codes or authorities having Jurisdiction.

 

## Installation

 The D1256 and D1257 system annunciators connect to fire control/communicator and fire detectors via four-wire cable (with shielded wiring being recommended if excessive EMI levels exist), with field wiring terminating on a four-pin connector on each unit’s rear side. Follow installation instructions, NFPA 72, local codes and Authority Having Jurisdiction when installing and testing these devices. The D9127U annunciator is polarity sensitive; ensure all POPIT loop wiring that connects to it are landed correctly to avoid point trouble; often disconnecting and reconnecting loop wiring momentarily will work to clear it. Smoke detectors require Detector Reset on either their panel or keypad by entering code>+Enter+Command+47 in order to reset them successfully.

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