Overview
LCD4500/LCD4501/LCD5500Z programmable-message keypads are operator interfaces for MAXSYS PC4010/PC4020 systems. They support full status, arming, programming entry, and trouble scroll on Combus.
Panel bus / link type
Combus (MAXSYS)
At a Glance
| Detail | Value |
|---|---|
| Product type | Alarm keypad / operator interface |
| Model family (LCD4500, LCD4501, LCD4501T, LCD5500Z) | See label and install manual |
| Bus / wireless link | Combus (MAXSYS) |
| Primary manual | LCD4501(T) Installation Manual; MAXSYS PC4020 Install Manual keypad section |
| Region / listing notes | T suffix models for telco/listed variants — match manual to label |
Before You Install or Replace One
- Confirm exact model number on the keypad label matches the install manual.
- Verify host panel family — Keybus PowerSeries, Neo Corbus, MAXSYS Combus, and IMPASSA wireless are not interchangeable.
- Plan unique keypad address or wireless enrollment — duplicates cause bus collisions or offline devices.
- Check partition assignment (global vs partition keypad) for multi-partition sites.
- Include keypad current draw in panel AUX / Corbus / battery standby calculations.
Official Sources
- Product page: DSC MAXSYS Programmable-Message LCD Keypad (ID 6)
- LCD4501(T) Installation Manual; MAXSYS PC4020 Install Manual keypad section — DSC official documentation
Installation Notes
Follow LCD4501(T) Installation Manual; MAXSYS PC4020 Install Manual keypad section for mounting, wiring, addressing, and enrollment. Summary below — not a substitute for the full manual.
Pre-install checklist
- Match keypad SKU to host panel family (see compatible-peripherals.md).
- Select mounting height and tamper-secure back box per local code.
- Reserve bus power or confirm wireless transceiver capacity on panel.
- Plan partition and global keypad roles for multi-partition installs.
Typical install sequence
- Mount keypad back box and pull bus or confirm wireless coverage at location.
- Wire Keybus/Corbus homerun or begin wireless enrollment per manual.
- Assign keypad address in panel programming (
[013]PowerSeries,[902]Neo/Pro, DLS for MAXSYS). - Set partition assignment and display options.
- Test arming, disarming, trouble display, and prox/RF features if equipped.
- Document address, partition, and installer access for service handoff.
Regional notes
T suffix models for telco/listed variants — match manual to label
Source: LCD4501(T) Installation Manual; MAXSYS PC4020 Install Manual keypad section (DSC official documentation).