Overview
MAXSYS access control kits bundle PC4820 door control, PC4850 card access, readers, credentials, and related Combus modules for PC4020-based integrated intrusion + access installs. Access shares the same panel, partitions, user codes (up to 1,500), and 64 access levels as burglary—doors can be shunted, scheduled, and reported through the same communicator.
End-user benefits highlighted in DSC's MAXSYS end-user guide:
- Seamless integration — One system monitors who enters and when, tied to intrusion partitions.
- Simple operation — LCD keypads with programmable function keys; one-button arming shortcuts.
- Rugged reliability — Industry-leading lightning and static protection on MAXSYS panels.
- False alarm reduction — Panel features reduce nuisance alarms on commercial sites.
- IP reporting — T-Link TL-250/TL-300 uses existing LAN paths with AES encryption options.
Typical targets: middle-market retailers, schools, government buildings, industrial complexes, financial institutions, and high-end multi-unit residential.
At a Glance
| Component | Role |
|---|---|
| PC4020 host | Intrusion + access logic, Combus, communicator |
| PC4820 | Door control modules (up to 16 on system) |
| PC4850 | Card access control modules (up to 16) |
| User codes | 1,500 codes; assign to access levels and partitions |
| Automation | PC4401 DataLink optional for building automation tie-in |
Before You Deploy a Kit
- Confirm door count, reader type, and fail-safe vs fail-secure hardware per door.
- Plan Combus addresses for PC4820/PC4850 alongside zone and output modules.
- Program access levels, time zones, and anti-passback rules in DLS—not at the keypad alone.
- Verify fire release and unlock on AC loss requirements with local code.
Official Sources
- Product page: DSC MAXSYS Access Control Kit (ID 24)
- 30-214 MAXSYS End-user Cheat Sheet; MAXSYS 12-page brochure — DSC official documentation
- PC4020 v3.5 Installation Manual and PC4820/PC4850 module install sheets
Troubleshooting
Door Won't Unlock on Valid Code
- Verify user code access level and partition assignment in DLS.
- Check time zone / schedule for that door and user.
- Confirm PC4820 output programming—strike output not overridden by panel trouble inhibit.
- Run diagnostics
[04]on the PC4820 module serving that door—E/T/LV faults block operation. - Measure strike power separately—PC4216/PC4204 outputs have current limits.
Reader Not Responding
- PC4850 enrollment and address on Combus.
- Reader cable length and power within module spec.
- Tamper on reader or module shows T in diagnostics.
Access Events Not Reporting
- Access reporting codes programmed in section 12.7 (Contact ID / SIA).
- FTC or alt-comms faults block all event transmission—fix communicator first.
Integration with Intrusion
- Door shunt while armed programs via PC4820 zones—verify shunt timing vs intrusion rules.
- Global vs partition keypads affect which users see door status.
Source: PC4020 programming manual; PC4820/PC4850 install sheets; 30-214 end-user guide.