I. Basic Information

Model: MVME162PA-244LN

Brand: Motorola / Emerson / Abaco

Series: MVME162PA (6U VME SBC, 244 = 4IP + Dual Networks)

Form: 6U VME Dual High Single Board Computer

Core Features: 25MHz 68LC040 (no FPU), 16MB, 4×IP, Dual Ethernet, No SCSI, 0 - +70°C, Robust, No VME Chip, No Heat Sink.

II. Suffix Meanings (Key: N = No VME bus interface chip)

244: 4×IP, dual network, 16MB, no FPU

L: Reinforced (anti-vibration, strengthened welding)

N: NO VME BUS CHIP (no VME bus controller) → Cannot be used as VME master/slave, can only run locally

Rule: L = Reinforced, N = No VME, E = Wide temperature, S = Heat dissipation

III. Core Hardware (Same as 244 full series)

CPU: MC68LC040, 25 MHz (no FPU, 8KB cache + MMU)

DRAM: 16MB (parity check)

SRAM: 512KB (battery backup)

Flash: 1MB (162Bug firmware)

RTC/NVRAM: 8K×8, battery backup

IV. Board-mounted I/O (Key point: No VME, 4IP, dual network, no SCSI)

✅ Dual 10Mbps Ethernet (DMA)

✅ 2×Serial ports (EIA-232-D)

✅ 4×IndustryPack (IP) expansion slots (independent DMA)

❌ No SCSI interface

❌ No VME bus interface (N suffix) → Cannot be connected to VME backplane, cannot communicate with other VME boards

✅ 6×32-bit timers + watchdog

V. Environment and Electrical

Operating temperature: 0°C ~ +70°C (normal industrial grade)

Reinforced: ✅ Anti-vibration, strengthened welding

Heat dissipation: ❌ No original heat sink

Power supply: +5V, typical 2.5A

Size/Weight: 6U VME, approximately 0.8kg

VI. 244LN vs 244L vs 244LE (Most frequently asked by customers)

244LN (your model): 4IP + dual network + reinforced + normal temperature + no VME + no heat dissipation → Local independent operation, no need for VME backplane

244L: 4IP + dual network + reinforced + normal temperature + with VME + no heat dissipation → Standard VME reinforced

244LE: 4IP + dual network + reinforced + wide temperature (-40~+85°C) + with VME + no heat dissipation → Wide temperature reinforced VME

One-sentence difference: N = Remove VME, can only be used locally; L = Reinforced; E = Wide temperature

VII. Typical Applications (Exclusive scenarios for 244LN)

No VME backplane, independent embedded control

High vibration (vehicle / ship), normal temperature (0~70°C)

4 IP expansion cards (analog / digital / serial ports) required

Dual network redundancy, high network reliability

No floating point, no SCSI, pursuit of multiple I/O + reinforced + independent operation

VIII. Compatibility and Replacement

In the same series, cannot be directly interchanged: 244LN (no VME) ≠ 244L/244LE (with VME)

Pin compatibility but different functions: 244LN cannot be connected to VME system