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TYPICAL CABLE WIRING:
To connect to an IBM AT or compatible use a cable with one
male and one female DB-9 connector with all nine pins connected straight through.
RS-232 COMMUNICATIONS PARAMETERS
The unit leaves the factory with the following default communication settings :
BAUD
300
WORD LENGTH
7 bits
STOP BITS
1
PARITY
ODD
These settings may be changed using the local or remote display keyboard, or RS-232 Interface
commands. If the RS-232 Interface is used, initial communication with the computer or terminal
must be established using the above settings. To return the RS-232 settings to the above default
values:
1. Unplug the unit power cord or otherwise remove power.
2. Depress the internal Calibrate button.
3. Plug in (or energize) the unit and continue to hold the
calibrate button for 5 seconds.
For information on how to reconfigure the RS-232 parameters, refer to the "Calibration and
Programming Manual".
COMMAND FORMATS
The Model
7500
can be controlled from an external device (such as a computer or terminal)
by various commands, each three letters long, which represent related English phrases or
words. For example, to tell the scale to zero, type ZRO followed by a carriage return.
When the scale receives command strings, they are first placed in a 125-character buffer. If
many commands are sent to the scale at high baud rates, it is possible to completely fill this
buffer and data will be lost. Be sure to send commands to the scale at a rate which does not
exceed 125 characters every 500 ms.
The basic command formats are:
1. [<add>]<cmd><cr>
2. <cmd> [<flt>]<cr>
Where <cmd> is a three-letter command, <add> is a scale address number (0-255), <cr>
represents a carriage return, and <flt> is a mixed number, the brackets [ ] are used to indicate
an optional part of the command.
Содержание 7500 Series
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