DESCRIPTION

The HEF4738V is an implementation of the IEC-bus as described in IEC report 66 CO 22 (interface system for programmable measuring apparatus) as well as in IEEE standard 488-1975 (standard digital interface for programmable instrumentation).

Together with bus-drivers, level converters and multiplexers it is suitable for connecting electronic programmable and non-programmable equipment to an IEC/IEEE interface bus.

All inputs have standard HE4000B family levels. In the circuit the following standard interface functions are incorporated:

• Complete source handshake (subset SH1)

• Complete acceptor handshake (subset AH1)

• Basic talker with serial poll and talk-only mode (when It = LOW, subset T1; It = HIGH, subset T5)

• Basic listener with listen-only mode (when It = LOW, subset L1; It = HIGH, subset L3)

• Complete service request (subset SR1)

• Complete remote local (subset RL1)

• Remote parallel poll configuration (subset PP1)

• Complete device clear (subset DC1)

• Complete device trigger (subset DT1)

• Some controller facilities