User`s manual

80 Extension Modules
Communications:
X Multi-drop full-duplex RS-422 with transformer isolation
scheme
X Data Rate: 6Mbps
X I/O refresh rate: 30.1µs x numbers of slave I/O modules
(min: 3; max: 63)
X Communication model: single-master/multi-slave
X Communication method: command-response
X CRC12 and dedicate protocol for eliminating
communication errors
Specifications
PCI Controller:
X PCI local bus specification Rev. 2.1 compliance
Master Controller:
X Master controller: ASIC
X External Clock: 48MHz
Memory:
X 32KB SRAM - 12ns
Interface:
X RS-422 with transformer isolation
X Full duplex communication
X Selectable transfer speed by dip switch (Default 6Mbps)
X Two ports for one control master
Connector:
X Four RJ45 connectors (H1A, H1B, H2A, H2B for PMC-
7852G)
Interrupt:
X 32 bits Programmable timer