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