System Architecture

Every system follows the same control rule: one DMEX module per dispenser, one LVDD module per dispenser, and one LVDD motherboard per four LVDD modules.

Terminal strip wiring

Terminal strip wiring

Reference layout for field tracing

Universal architecture

DISPENSER
   │
   ├── LVDD module
   │      ├─ card reader
   │      ├─ video
   │      ├─ dispenser data
   │      └─ communications
   │
   └── DMEX module
          ├─ hook signal
          ├─ 120V dispenser enable
          ├─ E-stop / reset logic
          └─ pump contactor output

Every dispenser has its own DMEX + LVDD pair. Larger systems simply repeat this architecture across more dispensers.

Scaling rule

Dispensers	DMEX	LVDD	LVDD Motherboards
1–4	1–4	1–4	1
5–8	5–8	5–8	2
9–12	9–12	9–12	3
200	200	200	50

Important design notes

One DMEX module per dispenser in all sites
One LVDD module per dispenser in all sites
One LVDD motherboard supports up to 4 LVDD modules
All service calls should begin with DMEX and LVDD
Customer-specific drawings are excluded from this portal until scrubbed

Complete system terminal strip wiring

Complete system terminal strip wiring diagram

This is a useful field-service reference when tracing signals across DMEX modules, terminal strips, and pump outputs.