  | Honeywell PML  Bus Interface Unit |   | 
- The BIU consists of four processes:
- LBRCV receives tokens from local bus 
 - LBTX transmits tokens on the local bus
 - BIURCV receives tokens from the global bus
 - BIUTX transmits tokens on the global bus
 
 - The BIU is a generic module that performs handshaking for other modules
- Shields modules from details of the bus
 
 
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