The HP-IB 82937A is a hardware and software interface for Hewlett-Packard Series 80 Computers that enables IEEE 488-1978 compliant communication with up to 14 HP-IB compatible instruments per interface. The system supports bidirectional, asynchronous data acquisition and instrument control through an onboard interface processor managing bus protocol and device addressing.
Technical Specifications
• Standard Compliance: IEEE 488-1978 Digital Interface for Programmable Instrumentation
• Device Capacity: Up to 14 HP-IB compatible instruments per interface
• Maximum Bus Cable Length: 20 meters total
• Data Transfer Rates:
– Transfer Interrupt: 400 bytes/s
– Enter & Output: 1400 bytes/s (Input), 3000 bytes/s (Output)
– Transfer FHS: 26.2K bytes/s (Input), 25.5K bytes/s (Output)
– Absolute Maximum: 26K bytes/s
• Data Lines: Eight bidirectional data lines for input and output
• Bus Addressing: 32 valid addresses (0–31); factory-set address is 21 (decimal)
• Select Code: Eight possible select codes (range 3–10); factory setting is 7
• Handshake Protocol: Three-wire handshake mechanism for device-speed-adaptive communication
– Key Features
• Configurable as system controller or non-system controller (factory default: system controller)
• Interrupt-capable with I/O ROM support: active controller, active talker, active listener, service request (SRQ), interface clear (IFC), device clear (DCL/SDC), device trigger (GET), and secondary command (SCG)
• Parallel poll response configurable via jumper wire; factory configuration asserts bit 0 of data lines during SRQ
• Interface processor handles efficient protocol management across the HP-IB bus
– Electrical Characteristics
• IEEE 488-1978 maximum electrical capability: 15 devices including controller
• Implements standard open-collector/open-drain bus architecture
– Compatibility & Integration
Designed for integration with Hewlett-Packard Series 80 Computers and HP-IB compatible instruments and peripherals compliant with IEEE 488-1978.
