User`s manual

60 • Extension Modules
5.8 PMC-7852G
 5.8.1 Features
General:
• One master has two HSL ports
• One port can drive maximum 32 modules
• One master can control maximum 63 slave I/O modules
• Maximum wiring distance for each port: 200m (serial wiring from master to
last slave module)
Wiring:
• Connector: RJ45 (on both master controller and slave modules)
• Cable: Cat.5 100 Base/TX Ethernet cable, shielded preferred
Communications:
• Multi-drop full-duplex RS-422 with transformer isolation scheme
• Data Rate: 6Mbps
• I/O refresh rate: 30.1 µs x numbers of slave I/O modules (min: 3; max: 63)
• Communication model: single-master/multi-slave
• Communication method: command – response
• CRC12 and dedicate protocol for eliminating communication errors
 5.8.2 Specifications
PCI Controller:
• PCI local bus specification Rev. 2.1 compliance
Master Controller:
• Master controller: ASIC
• External Clock: 48MHz
Memory:
• 32KB SRAM – 12ns
Interface:
• RS-422 with transformer isolation
• Full duplex communication
• Selectable transfer speed by dip switch (Default 6Mbps)
• Two ports for one control master
Connector:
• RJ45 connector x 4 (H1A, H1B, H2A, H2B for PMC-7852G)