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‐ “RECORD STM 21” is the main electronic control module used in agta-record / ASSA ABLOY System 20 & System 21 automatic sliding-door operators. It governs motor drive, evaluates all activation- and safety-sensor inputs, handles operating-mode logic, and communicates with peripheral options such as battery back-up, fire-alarm interfaces and remote key switches.
Key points
• 24 V DC, active-HIGH I/O logic, SIL/PL-rated to ISO 13849-1
• Drives a 24 V brushless DC or 3-phase synchronous motor via integrated H-bridge / inverter stage
• Processes radar, active-IR curtain, light-barrier, emergency-stop and door-edge sensors
• Provides operating modes: Automatic, Exit-Only, Partial-Open, Night/Locked, Hold-Open, Off
• Variants: STM 21 (standard), STM 21 RED (re-dundant safety, fire-door or escape-route use), STM 21 X (regional HW rev.)
Functional blocks
• Power-supply section: 90-264 VAC → 24 V DC SMPS (external or in header rail).
• Motor drive: 3-phase MOSFET or full-bridge for 24 V BLDC; closed-loop velocity via hall/encoder.
• Logic core: 16/32-bit MCU with door-state finite-state-machine and fault handling.
• I/O:
‑ Activation (radar/push-button) – galvanically isolated, active-HIGH 24 V.
‑ Safety (IR curtain, light beams) – monitored NC loop or opto-input; any break keeps door open.
‑ Door-position sensors (magnet/encoder) for soft-start/stop and obstacle detection.
‑ Relay / transistor outputs for door-status, alarm, lock control, building-management.
• HMI: seven-segment display or LEDs for parameter index, two push-buttons for programming; DIP-switches or rotary selectors for country-specific defaults.
Typical electrical parameters
• Supply to board: 24 V DC ±10 % @ ≤3 A (motor idle)
• Motor phase current limit: 6–8 A (software adjustable)
• Digital inputs: ≥18 V logic-high, <5 V logic-low, opto-isolated 10 mA typ.
• Safety relay output: 2 A/30 V DC (resistive)
Commissioning workflow (summary)
Frequent field issues and remedies
• Door does not open → Check 24 V line, activation input voltage, diagnostic LED (E-codes).
• Door re-opens at end of close → Safety input false trigger; inspect IR curtain alignment or dirty lenses.
• Erratic travel / humming → Encoder connector loose; motor phase imbalance; run teach-in again.
• No reaction after replacement → Remember STM 21 uses active-HIGH; wiring from older STM 20 active-LOW must be adapted.
• Since 2022 the successor controller “STA 22” is supplied on many new Record operators; STM 21 spares remain fully supported and are still shipped by Record/ASSA ABLOY and distributors (MaceGulf, Auto-Door-Parts UK, etc.).
• Latest HW revision STM 21-R3 supports EN16005 2023 amendment for low-energy mode and has firmware ≥V4.1 allowing ModBus-RTU BMS integration.
• Battery module BAT 19 is now RoHS 3-compliant and uses LiFePO₄ cells instead of NiMH, offering >20 min autonomy.
Future directions
• Cloud-connected gateways (Record Link) enable predictive maintenance using data streamed from STM/STA boards.
• EN 17352 “intelligent doors” draft will likely mandate logged cycle counts and fault statistics—already implemented in FW V4.x.
• Active-HIGH logic: every functional input (e.g. “Safety1”) must be driven to +24 V for the controller to allow motion; an open or 0 V line is interpreted as fault/unsafe. This is opposite to some older DIN-norm door systems—double-check when retrofitting.
• Safety level: with correctly wired monitored sensors the STM 21 achieves Performance Level d, Category 2 (ISO 13849-1 2006 test certificate No. ZS-19-051).
• Analogy: Think of STM 21 as a PLC-driven VFD dedicated to a linear motor axis where the “axis” is the door leaf. The firmware encapsulates the motion profile and safety requirements mandated by EN 16005, relieving installers from low-level coding.
• Compliance: Doors controlled by STM 21 must be commissioned in line with EN 16005 (Europe) or ANSI A156.10 (North America). Installer is legally responsible for annual safety inspection logs.
• Safety: Tampering with speed, force limits or bypassing safety inputs violates CE/UL certification and can incur liability for injuries.
• Data privacy: Newer firmware stores door-cycle & fault logs; if connected to a building network ensure GDPR-compliant handling of log data.
• Always isolate mains before removing header covers; motor supply is still live at 24 V high-current even when mains is pulled.
• Keep sensor fields clear during power-up so the controller can learn the static environment.
• Use manufacturer’s handheld programmer or PC dongle for parameter backup before replacing a board; upload file to the new board to avoid lengthy re-commissioning.
• When motor is replaced together with controller, re-run torque-profile teach-in or the door may stall.
• Label all field cables with terminal numbers (per STM 21 manual p. 19) to speed future troubleshooting.
• The term “STM-21” is also used in biopharmaceutical research (Secretome Therapeutics). In an automation context “RECORD STM 21” unequivocally refers to the door-controller; ensure you order from door-hardware suppliers.
• Exact wiring colours, parameter codes and error LED patterns can differ slightly between firmware-generations; always consult the manual that matches the board’s part-number (e.g., 102-021808409 vs 102-021812642).
• agta-record technical bulletin TB-STA-2024-04 (ModBus integration).
• EN 16005:2023 commentary for updated force-limitation test methods.
• IEC 62443-4-2 for upcoming cyber-security requirements on connected door controllers.
• Study of brushless motor commutation failures in high-cycle entrance systems (IFAS 2025 conference).
RECORD STM 21 is the heart of System 20/21 sliding-door operators, combining motor drive, safety-logic and user-interface in one SIL/PL-rated module. It runs on 24 V active-HIGH logic, supports multiple operating modes, and interfaces with radar and IR safety sensors. Correct installation, parameterisation and annual safety checks are essential for legal compliance (EN 16005, ISO 13849-1). While a newer STA 22 platform exists, STM 21 remains widely installed and fully supported; technicians should stay familiar with its diagnostics, firmware updates and integration options.
