INTRODUCTION
I-E96-607A
2 - 1
SECTION 2 - DESCRIPTION AND OPERATION
INTRODUCTION
INFI-NET is a unidirectional, high-speed serial data highway
that all INFI 90 nodes share. The INNIS01 Network Interface
Slave Module and the INIIT02 INFI-NET to INFI-NET Transfer
Module make up an INIIR01 INFI-NET to INFI-NET Remote
Interface. Two network interface slave (NIS) modules and the
INIIT03 INFI-NET to INFI-NET Transfer Module make up an
INIIL02 INFI-NET to INFI-NET Local Interface. This section of
the product instruction provides an overview of INFI-NET inter-
face module operating theory.
MODULE INTEGRITY
All INFI-NET communication modules have normal INFI 90
security functions that insure module integrity. Module hard-
ware checks for illegal addresses, and monitors the machine
fault timer and the I/O expander bus clock. If a module detects
an illegal address, it generates a bus error and displays an
error code on the faceplate LEDs. If the processor fails to reset
the machine fault timer, it expires. When the machine fault
timer expires, the communication module stops and the status
LED turns red. Module hardware also monitors the I/O
expander bus clock. If there is no clock signal, the module
hardware generates an interrupt causing the module to stop.
NIS MODULE
The NIS module interfaces both the INIIT02 and INIIT03 trans-
fer modules to an INFI-NET loop. The NIS module operates
with each type of transfer module in the same manner.
Messages
The NIS module processes four different message types: Broad-
cast, time synchronization, multicast and NIS poll.
BROADCAST
A node generates a broadcast message when sending informa-
tion to all system nodes. Typically, these messages announce
changes in node status. Broadcast messages include
NODE
ONLINE
,
NODE OFFLINE
,
NODE RESTART
and
NODE BUSY
.
