R&S ZVL
Interfaces and Connectors
Rear Panel Connectors
Operating Manual 1303.6580.32-05
589
Bus lines
1. Data bus with 8 lines
D0 to D7
The transmission is bit-parallel and byte-serial in
the ASCII/ISO code. D0 is the least significant bit, D7 the most significant bit.
2. Control bus with five lines
IFC (Interface Clear):
active LOW resets the interfaces of the instruments connected
to the default setting.
ATN (Attention):
active LOW signals the transmission of interface messages, inactive
HIGH signals the transmission of device messages.
SRQ (Service Request):
active LOW enables the connected device to send a service
request to the controller.
REN (Remote Enable):
active LOW permits switchover to remote control.
EOI (End or Identify):
has two functions in connection with ATN:
ATN=HIGH active LOW marks the end of data transmission.
ATN=LOW active LOW triggers a parallel poll.
3.Handshake bus with three lines
DAV (Data Valid):
active LOW signals a valid data byte on the data bus.
NRFD (Not Ready For Data):
active LOW signals that one of the connected devices is
not ready for data transfer.
NDAC (Not Data Accepted):
active LOW signals that the instrument connected is
accepting the data on the data bus.
The analyzer provides the following functions to communicate via GPIB bus:
•
Interface functions
•
Interface messages
•
Instrument messages
Interface Functions
Instruments which can be controlled via GPIB bus can be equipped with different interface functions. The
interface function for the network analyzer are listed in the following table.
