Teledyne 6712SR - Manual (Page 141)

7-1
6712SR Refrigereated Sampler
Section 7 Remote Operation
The 6712 controller can be operated remotely from external
devices. External controlling devices may be a computer via
RS-232 serial communications or a telephone via touch-tone com-
m a n d s . R e m o t e t e l e p h o n e o p e r a t i o n r e q u i r e s t h e
factory-installed 2400 baud talking modem.
7.1 Computer Operation The 6712 controller can be operated from a remote location using
a computer. There are two different levels of computer control.
One level—menu control—is used to start and stop the current
sampler program (or programs if in Extended programming
mode) and to access other menu commands. This level of remote
operation relies on the sampler program for much of its capabil-
ities.
The second level— external program control—relies on external
programmatic control to drive the operation of the sampler. The
external controller can turn on the sampler, take a sample, and
request sampler status data. When under external program
control, the sampler controller program and current operation
state are ignored. The pump, distributor, and serial data output
simply respond to the external commands.
Each level of operation is discussed in the following sections.
However, before using either level of control you must first
establish RS-232 serial communication between the computer
and the 6712 controller. To do so:
1. Connect your computer to the 6712 controller’s interroga-
tor connector with a standard interrogator cable, P/N
60-2544-044 (for 9-pin serial ports).
2. Configure your communications software (HyperTerminal,
for example) for:
· a baud rate no higher than 19,200
· no parity
· 8 data bits
· 1 stop bit
· VT100 terminal emulation.
3. Using your communications software, connect to the sam-
pler. Press “?” on the computer keyboard until the sampler
returns its banner string. A “>” prompt will appear on the
screen when it is ready to accept commands.