TMR-04A Isolated-Ground TM Probe with Green/Red LED
The TMR-04 with a green/red LED — isolated ground and a two-colour answer at the contact.
Two independent LED colours behind the same contact ring, so the probe can say more than "I read something". Green for accepted, red for refused — the user knows immediately whether to walk through or find the office, and fewer questions reach the guard. The copper contacts sit inside a moulded ABS capsule, so the key ground is designed to stay isolated from the panel, which helps avoid the ground loops that can affect metal-bodied probes in steel doors and machine enclosures. A JST-style connector carries DATA, GND, GREEN+ and RED+ — plug it in, drive each colour from a spare controller output. Compatibility depends on your controller; test a sample on your own system before ordering.
Ordering information
| MOQ | Confirmed by model and order when quoting |
|---|---|
| Preparation time | Availability and lead time are confirmed by model and order when quoting |
| Packing | Confirm pack quantity, protection and labelling for the selected model. |
| Samples | Sample quantity, fees and shipping are confirmed for the selected model. |
| Payment | Agree payment terms and the payee in the quotation and invoice. |
| Shipping | Confirm the shipping method, cost and timing for your destination and order. |
| Customization | State ROM, colour, marking and packing needs; feasibility and cost require confirmation. |
Two colours, isolated ground — the answer and the fix in one part
Single-colour probes can only tell the user that something happened; this one tells them what happened. Green and red are separately wired, so your controller can distinguish accepted from refused, armed from disarmed, or in-hours from out-of-hours — the information that can stop people re-presenting a key that was never going to work and calling it a fault. Underneath, it keeps the property that defines the TMR-04 family: the ABS capsule is designed to isolate the key ground from the mounting surface, so it can be considered for a steel entrance plate, an aluminium kiosk or a vehicle panel without creating a second ground path, a possible cause of intermittent, hard-to-reproduce read failures (check on your own panel). If you do not need the LED, order the TMR-04; if you need a metal body with a single LED instead, see the TMR-02-4P.
Key features
- Integrated green/red LED gives a two-state user-feedback signal — accepted or refused, right at the contact.
- ABS capsule keeps the key ground isolated from the outer case, for mounting in metal doors, kiosks and machine panels; check the drawing and your wiring before ordering.
- Copper contacts for clean signal transmission; the self-aligning face guides the key onto the contact.
- Ø24.01 mm face, Ø19.06 mm contact ring, 22.37 mm body, M12 threaded neck with fixing nut.
- 125 mm AWM 2464 24 AWG lead on a 4-pin connector: DATA, GND, GREEN+, RED+.
Specifications
| Chip / compatibility | Model TMR-04A · for DS1990A / TM1990A / RW1990 projects; verify the supplied key and reader versions with the target controller |
|---|---|
| Package | Copper contacts in a moulded ABS capsule — GND isolated from the outer case · Ø24.01 mm face, Ø19.06 mm contact ring, 22.37 mm body |
| Mounting | Panel mount, M12 threaded neck with nut; 125 mm 24 AWG lead (cable style and ratings: confirm for the supplied version), JST-style 4-pin connector |
| Protocol | 1-Wire on DATA. Connector pinout: DATA · GND · GREEN+ · RED+ — the two LED colours are driven independently |
| Operating temperature | −40 °C … +85 °C (1-Wire chip, per the original manufacturer's datasheet; confirm for the supplied version) |
| Options | Cable length, connector type, colour and other customization options: feasibility, MOQ and cost are confirmed in the quote. Two-wire version without LED: TMR-04 |
Product dimensions
Typical applications
Frequently asked questions
What does the TMR-04A add over the TMR-04?
A green/red dual LED at the contact, brought out on a four-core lead (DATA, GND, GREEN+, RED+) — accepted or refused, signalled right where the user touches the key. The isolated-ground ABS capsule is identical.
Can it be mounted straight onto a metal panel?
Yes — like the TMR-04, the copper contacts sit inside a moulded ABS capsule, which is designed to keep the key ground off the mounting surface. On steel doors, kiosks or machine panels this normally means no extra insulation and no ground loop through the panel; check on your own panel and wiring.
What lead and connector does it ship with?
A 125 mm AWM 2464 24 AWG lead on a 4-pin connector as standard. Cable length, connector type, capsule colour and other customization options: feasibility, MOQ and cost are confirmed in the quote.
Related products
TMR-01 Copper TM Probe
Chrome-plated copper probe with pre-wired leads — the minimal front-end.
TMR-01A Copper TM Probe with Guide Ring
The TMR-01 with a polymer guide ring — the ring helps guide the key onto the contact.
TMR-02 Panel-Mount TM Probe (DS9092 format)
DS9092-format panel probe with M18×1 nut and 200 mm leads — a familiar front end for controllers.
TMR-02-4P Panel Probe with LED (DS9092L format)
The TMR-02 with a built-in LED — four wires, so the controller can light the ring on a valid read.