Crestron RMC33-Series Room Media Controller PoE IR RS-232 Relay · NO ADAPTER

Crestron RMC3 — 3-Series Room Media Controller

A compact 3-Series control processor for driving a single room: displays, projectors, lighting, shades, climate and small AV systems. Runs the full 3-Series control engine with 256 MB RAM and 4 GB flash in an enclosure barely larger than a paperback, and takes its power straight from the network over PoE. Backed by a 12-month warranty from Reboot IT.

Key Benefits

• Full 3-Series engine, tiny box — the same control platform as Crestron's larger processors, in a 128 × 35 mm enclosure weighing 180 g.
• One cable does everything — PoE carries both power and network, so a single Cat cable to a switch port is the entire infrastructure requirement.
• Real control ports, not just IP — one bidirectional RS-232/422/485 COM port, two IR/serial outputs, two isolated relays and two digital inputs for equipment that has no network interface.
• Relays for the awkward jobs — two normally-open isolated relays drive screens, lifts, blinds and contact-closure devices directly.
• Mounts anywhere — freestanding, stackable, surface mount or 35 mm DIN rail, so it fits a lectern, a rack shelf or an electrical enclosure.
• Enterprise-grade networking — TLS, SSH, SFTP, IEEE 802.1X, SNMP and IPv6, so it survives a security review rather than needing an exemption.

Performance in Use

The RMC3 exists for the single-room job. A boardroom, classroom or huddle space needs a display switched on, an input selected, a screen lowered and the lights set — and it needs that to happen from one button rather than four remotes. A full rack-mount processor is overkill for that; the RMC3 does it for a fraction of the footprint.

What makes it genuinely useful is the mix of interfaces. Modern AV gear takes IP control, but the installed base does not: a projector on RS-232, an amplifier on IR, a motorised screen on a contact closure. The RMC3 speaks all of it, which is why these units are still deployed long after the displays around them have been replaced.

One thing to be clear about: this is a control processor, not a plug-and-play appliance. It runs a program written and loaded with Crestron's development tools, and it needs someone who knows that toolchain. Bought to extend or repair an existing Crestron estate it is straightforward; bought as a first step into room control with no programming resource, it will sit in a drawer.

Technical Specifications

Is It Right For You?

Condition Grades

Cosmetic grading describes the casing only. Every unit, whatever its grade, is tested to the same standard and carries the same warranty.

Frequently Asked Questions

Is a power supply included?

No. The RMC3 is PoE powered and takes its power from the LAN, so a PoE switch port is normally all it needs. If your switch has no PoE you will need an injector such as the Crestron PWE-4803RU, which is not supplied here.

Does it really have relay outputs?

Yes — two normally-open isolated relays on a 4-pin terminal block, alongside two digital inputs. They are what you use to drive a projector screen, a lift or any contact-closure device.

Do I need Crestron programming skills?

Yes. This is a control processor, not a consumer appliance — it runs a program authored in Crestron's development tools. If you are extending an existing Crestron system that is routine; if you have no programming resource, it will not do anything useful on its own.

Can it switch video?

No. The RMC3 controls devices — it sends commands over IP, RS-232, IR and relays. Video switching needs a separate switcher.

How is it mounted?

Freestanding, stacked, surface mounted or clipped to 35 mm DIN rail. At 128 × 35 mm and 180 g it fits almost anywhere, including inside an electrical enclosure.

What is shipping and delivery like?

Shipping costs apply based on size and destination — rates are calculated at checkout. Orders placed before the daily cut-off are typically dispatched the same business day from our Melbourne warehouse.