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72
Computer Interfacing
5.2.5
Command Termination
All the commands sent to the driver must be terminated by a <CR><LF>
sequence.
5.2.6
Response Termination
All the responses from the driver are terminated by a <CR><LF> sequence.
5.3
Controller Operation Mode
The Temperature Controller supports two modes of operation: LOCAL and
REMOTE. The instrument will be in LOCAL mode, by default, following a
power reset. In this mode, setpoint and output current limit values can be
adjusted by turning the knob on front panel of the instrument. Output can be
turned ON and OFF by pressing the output switch. Please refer the "System
Operation" chapter for a detailed description on how to accomplish these
tasks. When it is in REMOTE mode, knob control is disabled; setpoint and
other settings can be adjusted only by issuing appropriate commands from a
host PC. The REMOTE or LOCAL status indicator character can be found in
the LCD display.
By default, the instrument enters REMOTE mode when it receives any
command through USB communication interface. It can be setup to enter
this state on any set command only by setting the appropriate bit in
configuration register (refer "HWCONFIG" command). The instrument can
be put back in LOCAL mode by issuing "LOCAL" command.
5.4
USB Communication
The instrument is designed to communicate with a host PC via a standard
USB interface. Before connecting the instrument to the USB interface the
user should install the application included in the software CD that
accompanies the Temperature Controller. The application automatically
installs the right USB drivers. Communication can be done through this
interface by using the application or by developing software in the user's
preferred programming language. The software CD contains
communication drivers and example programs in the following
programming languages: LabVIEW and C#.NET
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