Stanford Research Systems SR865A, Operation Manual

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Programming 101
SR865A DSP Lock-in Amplifier
Chapter 4
Programming
Introduction
The SR865A DSP Lock-in Amplifier may be remotely programmed via the RS-232,
GPIB (IEEE-488), USB or ethernet interfaces. Any computer supporting one of these
interfaces may be used to program the SR865A. All interfaces can receive commands at
all times and the SR865A will send responses to the querying interface only. A few
specialized commands such as interface status and data streaming are interface specific.
Most instrument commands are common to all interfaces.
Communicating With GPIB
The SR865A supports the IEEE-488.2 (2004) interface standard. The SR865A's device
address must be set in the system menu (hold [Calc/
system ]).
Communicating With RS-232
The RS-232 interface baud rate and parity must be set in the system menu (hold
[Calc/
system ]). The RS-232 word length is always 8 bits. The transmit terminator
character(s) may also be specified.
Communicating With USB
The SR865A is a Test and Measurement Class instrument and easily interfaces with
LabVIEW, NI-VISA and Matlab.
Communicating With Ethernet
The SR865A supports VXI-11 and telnet and interfaces easily with LabVIEW, NI-VISA
and Matlab. In addition, SR865A has a built in webserver. Data streaming over ethernet
is also supported.
Before attempting to communicate with the SR865A over the ethernet interface, the
instrument IP address must be set in the system menu (hold [Calc/
system
]). Additional
settings for ethernet operation must also be set.
Status Indicators
To assist in programming, the SR865A has 3 interface status indicators. The Activity
indicator flashes whenever any interface is actively sending or receiving. The Error
indicator flashes when an error, such as an illegal command, or parameter out of range, is
detected. The
Remote indicator is on whenever the SR865A is in a remote state (front
panel locked out).