# Check the PNO-A9081RLP output before choosing a barrier relay > Review the documented TTL output and auxiliary power budget before approving the relay interface for this camera. - Canonical URL: https://update.dsesecurity.com/updates/check-pno-a9081rlp-output-before-barrier-relay/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-10-28T23:23:17+00:00 - Modified: 2026-10-28T23:23:38+00:00 - Last reviewed by DSE: 2026-10-28 - Resource type: Guide - DSE priority: Advisory - Topics: Access Control, Video Surveillance - Reading time: 3 minutes ## What you need to know Review the documented TTL output and auxiliary power budget before approving the relay interface for this camera. ## Potentially affected Integrations using the PNO-A9081RLP Road-Ai camera alarm output. ## DSE recommendation Have the integration designer reconcile the camera output, relay input and power requirements before authorizing installation. ## Article Bottom line: DSE recommends checking the output’s electrical contract before selecting a barrier relay. Review the camera signal, the relay’s trigger requirements and the available power as separate acceptance items, rather than approving the connection from an alarm-output label alone. ## Source fact: the documented camera example The [Hanwha Vision article](https://supportportal.hanwhavision.com/global/knowledge-base/47782325709075) distinguishes TTL alarm outputs from volt-free contacts. Its PNO-A9081RLP Road-Ai example uses a transistorized relay to obtain a volt-free output. For the named camera, the article describes a 12 V, 50 mA supply and a total auxiliary budget of 50 mA. Its example powers one relay from that budget. These are model-specific details of the documented example, not ratings for every Hanwha camera or relay. ## What the source does not establish The example does not establish compatibility with an arbitrary relay, gate operator or barrier input. It is not a complete electrical design, a universal resistor recipe, or evidence that a finished barrier installation meets its applicable requirements. Keep those decisions with the responsible designer and the exact equipment documentation. ## Applicability questions - Is the installed camera the exact model addressed by the article? - What signal does the proposed relay input require, and who has checked its documentation? - Which supply will power the relay, and what other loads are assigned to that supply? - What input does the downstream barrier controller expect, and who owns the final interface design? - Which physical result and recovery state must the acceptance test demonstrate? ## DSE recommendation: review the interface in three parts The following steps are DSE recommendations, not additional manufacturer specifications. Prepare a short interface record before installation. Identify the camera output terminal, the proposed relay input, the relay contact used by the barrier controller, and the power source for each component. Attach the relevant manual pages and record the exact relay model rather than relying on a generic relay-board description. Have the designer resolve signal conversion separately from power availability. Ask for an explicit comparison between the documented camera budget and the proposed load. If another supply is proposed, require its connections and responsibilities to be reviewed as part of the same design. Do not treat this article as approval to experiment with energized wiring. Define the intended command behavior before enabling plate-driven actions. Record who may change the triggering rule, what event should request the action, and who will observe the barrier. Include a stop condition and the approved method for restoring the previous configuration if the interface behaves unexpectedly. ## Verification and evidence Use an approved test plan with the equipment owner and qualified installation personnel. First compare the installed components and connections with the reviewed interface record. Resolve any difference before testing the automated action. During the planned test, collect the camera event, the output command, the relay response and the downstream controller’s observed result. Record both the requested action and its return to the intended resting state. Investigate a missing or persistent action at the relevant interface rather than changing several settings together. Keep the component identities, cited ratings, approved drawing, test observations and any corrective action together. Treat a later relay substitution or added auxiliary load as a reason to reopen the interface review. ## Official references - [Relay control on PNO-A9081RLP Road-Ai Camera](https://supportportal.hanwhavision.com/global/knowledge-base/47782325709075) — Hanwha Vision; named camera and relay example. Source review completed October 28, 2026. Recheck the official documentation and deployment-specific applicability before a production change. ## Primary reference - Name: Hanwha Vision: Relay control on PNO-A9081RLP Road-Ai Camera - Authority: supportportal.hanwhavision.com - URL: https://supportportal.hanwhavision.com/global/knowledge-base/47782325709075 - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Check the PNO-A9081RLP output before choosing a barrier relay,” DSE Security, https://update.dsesecurity.com/updates/check-pno-a9081rlp-output-before-barrier-relay/ Publishing principles: https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/ Usage and citation policy: https://update.dsesecurity.com/usage/ Copyright © 2026 Detection Systems & Engineering. All rights reserved.