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PROGRAMMING AND INTERFACING
The 1750 microprocessor is programmed to evaluate the RS232 command set on a priority basis up
to the command delimiter “X” as follows:
The “L” (limits), command is the only command that can have a conflicts error associated with it. If
the user attempts to set an upper limit on the comparator that is less than the lower limit or a lower
limit that exceeds the upper comparator limit a conflict error is generated. If a conflict error condition
is generated, the limits are not changed.
The “C” (recall setup), command supersedes all programming, (except for immediate commands), up
to the next “X” (execute), command. All commands following the “C” command will be ignored since
the “C” command is defining a totally new machine state. For example, in the command line, “C2R5X”,
C2 calls for memory location #2 to be restored into the 1750. The command R5 will be ignored since
the C2 command already defines a new range.
To force a user defined priority sequence, separate the commands with the command line delimiter,
X. For example, to change Delay time and then the range send the following: “D123XR2X”. This will
set the Delay time to 123 mS then set the instrument to Resistance Range #2.
If an “E”, command is sent to the 1750, it will return a reading to the controller in the form of ASCII
characters. The reading will be in the form of a numeric 4 ½ digit value followed by a SI unit prefix,
(n, u, m, k, or M), and Ohm units. This returned reading is completed by a termination sequence as
defined by the active “Yn” state, where n=0-4. Below are some examples of possible returned vales
for readings.
Over range Readings: “Over Range” “2.9999 or 29.999”
Broken Lead Condition: “Open Wire” “2.9999 or 29.999”
(
Ranges below 200 Ω)
Typical Reading Example: “1.2345 mOhm”
POWER UP AND DEVICE CLEAR DEFAULTS
When the 1750 is first powered up the machine state reinitializes to the last settings it had before its
last power down. To restore the unit to factory defaults an initialize command; “I” must be executed.
See Table 3.1 for a summary of these default settings.
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