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 the guard stops being asked. The copper contacts sit inside a moulded ABS capsule, so the key ground stays isolated from the panel and the ground loops that plague metal-bodied probes in steel doors and machine enclosures simply do not form. A five-wire tail on a JST-style connector carries DATA, GND, GREEN+ and RED+ — plug it in, drive each colour from a spare controller output.
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 stops 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 isolates the key ground from the mounting surface, so it can be screwed into a steel entrance plate, an aluminium kiosk or a vehicle panel without creating the second ground path that causes intermittent, unreproducible read failures. 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 — safe in metal doors, kiosks and machine panels.
- 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 | Factory model TMR-04A · reads all DS1990A / TM1990A / RW1990-class keys |
|---|---|
| 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 lead, AWM 2464 VW-1 80 °C 300 V 24 AWG, 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 |
| Options | Cable length, connector type and capsule colour to order. Two-wire version without LED: TMR-04 |
Product dimensions
Ordering information
| MOQ | 100 pcs |
|---|---|
| Lead time | 3–7 days for stock items, 10–15 days for OEM |
| Packing | Bulk ESD bags (100–200 pcs/bag, 2 bags/carton); blister or header cards for retail on request |
| Samples | Free samples for volume buyers — courier at cost |
| Payment | T/T bank transfer; other terms negotiable for repeat orders |
| Shipping | DHL / FedEx / UPS air express; sea or rail freight for pallet volumes |
| Customization | ROM ranges · housing colours · laser logo · private label |
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, so the key ground never touches the mounting surface. No extra insulation, no ground loops on steel doors, kiosks or machine panels.
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 and capsule colour can be customised on volume orders.
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 key lands on the contact first time, every time.
TMR-02 Panel-Mount TM Probe (DS9092 compatible)
DS9092-compatible panel probe with M18×1 nut and 200 mm leads — the industry-standard front end.
TMR-02-4P Panel Probe with LED (DS9092L compatible)
The TMR-02 with a built-in LED — four wires, so the controller can light the ring on a valid read.