R&S SMB100A Operating Manual page 506

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R&S SMB100A
IFC (Interface Clear): active LOW resets the interfaces of the instruments connec-
ted to the default setting.
ATN (Attention): active LOW signals the transmission of interface messages, inac-
tive HIGH signals the transmission of device messages.
SRQ (Service Request): active LOW enables the connected device to send a ser-
vice 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:
–
–
●
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 devi-
ces 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.
Interface Functions
Instruments which can be controlled via GPIB bus can be equipped with different inter-
face functions. The interface function for the R&S SMB are listed in the following table.
Table A-1: GPIB bus interface functions
Control character
SH1
AH1
L4
T6
SR1
PP1
RL1
DC1
DT1
Operating Manual 1407.0806.32 ─ 21
ATN=HIGH active LOW marks the end of data transmission.
ATN=LOW active LOW triggers a parallel poll.
Interface function
Handshake source function (source handshake), full capability
Handshake sink function (acceptor handshake), full capability
Listener function, full capability, de-addressed by MTA.
Talker function, full capability, ability to respond to serial poll, dead-
dressed by MLA
Service request function (Service Request), full capability
Parallel poll function, full capability
Remote/Local switch over function, full capability
Reset function (Device Clear), full capability
Trigger function (Device Trigger), full capability
Hardware Interfaces
GPIB Bus Interface
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