ABB AC 800F

6 Functional Description of the Ethernet Modules
6-25
6.5.2 Hardware structure
The AUI module EI 812F comprises the following hardware components:
• LAN controller/coprocessor, adapted to Intel RISC-CPU
32-bit data bus, 32-bit address bus, DMA, interrupt
• Serial interface/Manchester encoder for generating a serial bit stream
• EEPROM for configuration data.
• Regulated 12V power supply for AUI interface
• Isolator for electrical isolation of the bus signals
• Buffer battery holder with polarity reversal protection and monitoring circuit
• 15-pin SUB-D socket with slide lock for AUI interface
Block diagram
Fig. 6-12 AUI module block diagram
Connector pin assignment
AUI socket
Fig. 6-13 AUI connector pin assignment