Rohde & Schwarz R&S ZVA 8 - Interface Functions; Interface Messages

Rear Panel Connectors R&S
®
ZVA/ZVB/ZVT
1145.1084.12 8.10 E-3
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.
Control character Interface function
SH1 Handshake source function (source handshake), full capability
AH1 Handshake sink function (acceptor handshake), full capability
L4 Listener function, full capability, de-addressed by MTA.
T6 Talker function, full capability, ability to respond to serial poll, deaddressed by MLA
SR1 Service request function (Service Request), full capability
PP1 Parallel poll function, full capability
RL1 Remote/Local switch over function, full capability
DC1 Reset function (Device Clear), full capability
DT1 Trigger function (Device Trigger), full capability
Interface Messages
Interface messages are transmitted to the instrument on the data lines, with the attention line being
active (LOW). They serve to communicate between controller and instrument.
Universal Commands
Universal commands are encoded in the range 10 through 1F hex. They are effective for all instruments
connected to the bus without pervious addressing.
Command QuickBASIC
command
Effect on the instrument
DCL
(Device Clear)
IBCMD (controller%,
CHR$(20))
Aborts the processing of the commands just received and sets the command
processing software to a defined initial state. Does not change the instrument
settings.
IFC
(Interface Clear)
IBSIC (controller%) Resets the interfaces to the default setting.
LLO
(Local Lockout)
IBCMD (controller%,
CHR$(17))
The LOC/IEC ADDR key is disabled.
SPE
(Serial Poll
Enable)
IBCMD (controller%,
CHR$(24))
Ready for serial poll.
SPD
(Serial Poll
Disable)
IBCMD (controller%,
CHR$(25))
End of serial poll.
PPU
(Parallel Poll
Unconfigure)
IBCMD (controller%,
CHR$(21))
End of the parallel-poll state.