SECTION 2 - TECHNICAL DESCRIPTION
Page 2.1
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GENERAL PURPOSE REED RELAY MODULE 50-110/115-021/121
SECTION 2 - TECHNICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
A functional block diagram is provided in Figure 2.1. The Reed Relay Module is powered by a +5V input via the edge
connector. The interface to the user test equipment is via the front panel mounted 200-way SCSI type connector,
J1. The module comprises a PCB populated with 32 or 64, SPDT or SPST reed relays, depending on the module
type. The relays are energised via control signals from relay drivers U8 to U15. The relay driver is addressed by
PCI bridge U1 to output the required signal. Module configuration is determined by data stored in EEPROM U7. PCI
Bridge U1 is configured by EEPROM U2.
200-WAY SCSI
CONNECTOR
J1
RELAY
DRIVERS
U8 TO U15
CONTROL LOGIC
AND
MODULE
CONFIGURATION
U3 TO U7
PCI BRIDGE
U1
PCI BRIDGE
CONFIGURATION
U2
EDGE
CONNECTOR
+5V
0V
RELAY COILS
RELAY CONTACTS
Figure 2.1 - General Purpose Reed Relay Module (50-110/115): Functional Block Diagram
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