Introduction; Power-On Configuration; Device Clear - Stanford Research Systems BJT SIM911 Operation And Service Manual

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2.3 Introduction

2.3.1 Power-on configuration
2.3.2 Buffers

2.3.3 Device Clear

Remote operation of the SIM911 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 1.4.2.1).
See Table 1.1 for specification of the DB–15 SIM interface connector.
The settings for the remote interface are 9600 baud with no parity,
hardware flow control, and local echo disabled (CONS OFF).
Most of the SIM911 instrument settings are stored in non-volatile
memory, and at power-on the instrument returns to the state it was
last in when power was removed. Exceptions are noted in the com-
mand descriptions.
Reset values of parameters are shown in boldface.
Incoming data from the host interface is stored in a 32-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 mes-
sage is parsed and executed. Query responses from the SIM911 are
bu ered in a 64-byte output queue.
If the input bu er overflows, then all data in both the input bu er
and the output queue are discarded, and an error is recorded in the
CESR and ESR status registers.
The SIM911 host interface can be asynchronously reset to its power-
on configuration by sending an RS-232-style break signal. From the
SIM900 Mainframe, this is accomplished with the SRST command;
if directly interfacing via RS-232, then use a serial break signal. After
receiving the Device Clear, the interface is reset to 9600 baud and
CONS mode is turned OFF. Note that this only resets the communi-
cation interface; the basic function of the SIM911 is left unchanged;
to reset the instrument, see *RST.
Remote Operation
SIM911 BJT Preamp