Videx 4G GSM — Art. 4812 & 4812R

System Overview

The Videx 4812 is a SIM-based GSM audio door intercom for single and multi-apartment properties. When a visitor presses a call button, the panel dials the resident's mobile phone directly. The resident speaks to the visitor through the call and presses a DTMF key to release the door — no app, no broadband, no network required at the panel.

System Components

• Videx 4812 / 4812R door panel
• 12V DC power supply (PSU) — sized for the panel current draw
• Standard-size SIM card (voice plan required)
• Electric door release (strike or maglock)
• 2-core cable for door release
• Pure copper cable for power (no CCS or CCA)
• Micro-USB to USB cable (for GSMSK programming)

SIM Card Requirements

• Size: Standard SIM (not nano or micro — use an adapter if needed)
• Plan: Voice calls must be included — data-only SIMs will not work
• Network: Choose the network with the best signal at the installation location — test before committing
• Credit/allowance: Ensure the SIM has sufficient call allowance; residents receive incoming calls from the panel's number
• Insert SIM with the panel powered down

Power Supply & Cabling

• Supply: 12V DC
• Locate the PSU as close to the panel as possible
• Maximum cable resistance from PSU to panel: 3Ω
• Use pure copper (BC) cable only — Copper Coated Steel (CCS) and Copper Clad Aluminium (CCA) have higher resistance and must not be used
• Size the PSU to the panel's current draw plus the door release (if powered from the same supply)

Wiring

Connect per the wiring diagram in the installation manual. Key connections:

Back-EMF Protection — Essential

Always fit suppression on the door release load — failure to do so will damage the relay over time:

• DC electric strike or maglock: Fit a protection diode across the lock terminals — cathode (stripe) towards the positive terminal
• AC electric lock: Fit a capacitor across the lock terminals

LCD Display — Resident Names

The blue backlit LCD displays resident names that scroll across the screen. Visitors navigate using the panel buttons to find the correct resident, then press call.

Names are entered per call button in the GSMSK software alongside the phone number. Keep names short and clear — they display in sequence on the LCD.

Programming — GSMSK Software (Recommended)

GSMSK is Videx's free Windows programming utility. It is the most reliable and complete way to programme the panel.

Download: From videxuk.com — search GSMSK.

Steps

1. Connect the panel to a PC using a micro-USB to USB cable (panel can be powered during programming)
2. Open GSMSK and select the correct COM port
3. Click Read to pull the current configuration from the panel
4. For each call button, set:
   • Resident name — displayed on the LCD
   • Primary phone number — called when the button is pressed
   • Secondary/divert number — called if primary does not answer within the timeout period
5. Set call duration — how long the panel rings before giving up (typically 30–45 seconds)
6. Set DTMF release code — the key the resident presses to release the door (default: 9)
7. Set door release duration — how long the relay stays active (typically 3–5 seconds)
8. Click Write to send the configuration to the panel
9. Disconnect USB

Extended Divert (up to 10 buttons)

With the extended divert feature enabled, up to 10 buttons can each have 1 primary number and up to 5 divert numbers — useful where a resident has multiple household members or a follow-me setup.

Programming — Via SMS

Phone numbers can be updated remotely by sending SMS commands to the panel's SIM number — useful for changing a number without visiting site. Refer to the Videx 4812 technical manual for the full SMS command set.

Testing

• Each call button dials the correct mobile number
• Two-way audio is clear on all buttons
• Resident presses DTMF release code (9) — door release activates
• Door release duration is correct — door opens and re-locks cleanly
• LCD displays correct names and scrolls correctly
• Secondary divert tested where configured — call diverts if primary not answered
• Signal strength adequate — no dropped calls

Common Issues

Related Documents

• Getting Started — Door Entry & Access Control
• AES OPYN — Single Property
• Access Control Installation