Introduction; Power-On Configuration - Stanford Research Systems SIM918 Operating And Service Manual

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3.3 Introduction

3.3.1 Power-on configuration
3.3.2 Buffers
Remote operation of the SIM918 is through a simple command lan-
guage documented in this chapter. Both set and query forms of most
commands are supported, allowing the user complete control of the
amplifier from a remote computer, either through the SIM900 Main-
frame or directly via RS–232 (see Section 1.6.2.1).
See Table 1.2 for the specification of the DB–15 SIM Interface Con-
nector.
The initial settings for the remote interface are 9600 baud with no
parity and no flow control, and with local echo disabled (CONS OFF).
The following values are retained in non-volatile memory:
1. The power line frequency (FPLC).
2. The gain.
3. Autozero on o .
4. Input selection (on, open).
5. Input shield selection (program, bias, ground.)
6. Bias selection (on, ground).
7. Bias shield selection (float, ground.)
8. Whether or not the phase-locked loop stays active when au-
tozero is o .
9. Calibration values.
Upon power-on, those settings are restored to their values before the
power was turned o .
Where appropriate, the default or power-on value for parameters is
listed in boldface in the command descriptions.
The SIM918 stores incoming bytes from the host interface in a 64-
byte input bu er. Characters accumulate in the input bu er until
a command terminator (either CR or LF ) is received, at which
point the message is parsed and executed. Query responses from
the SIM918 are bu ered in a 64-byte output queue.
Remote Operation
SIM918 Precision Current Preamplifier