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Johnson Systems Inc

PRESIDOR Room Linker/Combiner

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Presidor™ Room Linker/Combiner (PRLC-4) is an intelligent multi-port DMX512 merger designed as the "hub" for the Presidor™ Wall Stations (PWS). PRLC-4 will allow input streams of DMX512 data to be merged when contact inputs are "patched" to create a larger room/zone. Each PRLC-4 will support up to 4 rooms/zones of PWS wall stations (DMX512) with isolated DMX inputs and an integrated 48VDC power supply to each room/zone. Multiple PRLC-4's can be cascaded together with RJ45 connection to permit up to 25 rooms/zones of PWS controls merged into a single DMX512 output. Field connections are either via RJ45 with Cat5/5e/6 wiring or terminal block over existing Belden 9773 wiring. Four (4) programmable maintained dry-contact inputs permit PWS (Presidor™ Wall Station) linking in any possible room/zone combination. At only 1RU in height the PRLC-4 will fit in any standard 19" rack or can be supplied with a small purpose built 19" wall mount rack (PRLCR-4U).



  • Four opto-isolated DMX512 data inputs with 48VDC power for direct connection to room/zone Presidor™ Walls Station (PWS) inputs.
  • One DMX512 "merged" output.
  • Field connections are via either RJ45 with Cat5/5e/6 wiring or "Phoenix style" terminal block over existing Belden 9773 wiring.
  • Multiple PRLC-4's can be cascaded together to support up to 25 rooms/zones of Presidor™ Wall Stations (PWS).
  • Intuitive user interface comprising of high contrast, low power, O-LED display and navigational pod interface allows for ease of operation.
  • Four programmable maintained dry-contact inputs for room linking.


  • Integrated network RJ-45 connection to optional Presidor™ Remote Display Unit (RDU) via Cat5/5e/6 wiring.
  • State-of-the-art high speed, low power "green" processor.
  • Onboard memory dongle for easy save and restore of all programmed "room patching".
  • Face panel LED indication of individual DMX room data inputs and power.
  • A 12VDC (10 Watt) supply to power industry standard auxiliary low voltage equipment.
  • UL approved NEMA C13 fused power disconnect (universal computer power receptacle) with integral illuminated power switch. Power cable included.
  • Patent Pending.


Shipping & Returns

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Shipping Options

We offer free ground shipping on most items for orders $300 and over, $20 for flate rate ground shipping on orders from $150 to $299.99, and $14 flat rate ground shipping on most items for orders under $149.99. *paints, liquids, and large volume items like boom bases (very heavy) or fake snow (not heavy, but very large) may incur a shipping surcharge. Exclusion of items from Free and Flat Rate shipping is at ProAdv's discretion. Offer is currently limited to Lower 48 US States.

We ship to North American addresses. Note that there are restrictions on some products, and some products cannot be shipped to international destinations, or even certain states depending on the item and state or local laws.

Our full policy is in our Terms and Conditions page.
Pandemic Availability Notice

Please Note: Due to unprecedented raw material and component shortages for finished goods throughout our industry, lead times for items that aren't currently in stock are longer than normal and cannot be guaranteed at present. Equipment needed by a firm date must be noted at time of order. While VLS cannot guarantee delivery by those dates, we will work with our suppliers to do everything possible to meet deadlines. We apologize for the inconvenience and appreciate your patience.

Same Day Shipping Cutoff time
(Due to Pandemic-related availability issues, this policy is currently suspended)

Online orders received by noon Eastern time typically ship the same day. If your delivery due date is critical please note your due date in the order messages at checkout, and then contact us.

Why Noon? Well, while we stock quite a few items in our warehouse, many items we have dropshipped by our vendors. They need time to process the order, so to ensure that we can get the order to the vendor and give them enough time to ship it out the same day, we need to get the order to them as early as possible in the day.

Shipping Rating

Please also note that the shipping rates for many items we sell are weight and dimension based, as this is the method that FedEx and UPS use to rate the package's cost to ship.

Returns Policy

We understand things happen and items occasionally need to be returned. To make things as hassle-free as possible, we have dedicated pages about our Returns Policy (what’s eligible to be returned) and our Return Process (how to go about returning eligible items)

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Need help? We're available at1-800-424-9991 - Email us