YSI 2700 SELECT, User Manual

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9-5
The 2700 can be placed in one of two communications modes: Result Reporting Mode or
Remote Control Mode. The selection between modes is made by the remote host. The default
mode at power-up is Result Reporting Mode.
2700 Data Base. The 2700 keeps a data base of 32 sample results and 1 calibration result in its
battery-backed RAM (random access memory). Only the most recent sample or calibration
result is shown on the instrument display. However, a remote host can ask for any of these
results at any time. This data base can be cleared by the host in Remote Control Mode (see
Section 9.3, Communications Commands).
Result Reporting Mode. Result Reporting Mode is designed for use with a computer system
that gathers sample results from various analyzers and records the results in a central data base.
In this mode, the host can always talk to the 2700 and get the result records.
The host requests the results by either sending the sample ID number and getting the result
record or by querying the unit for any untransmitted result in the data base.
Remote Control Mode. Remote Control Mode is designed primarily for industrial and research
applications where process control may be an important consideration.
In Remote-Control mode, the instrument is in RUN Mode and under control of the host
computer. The instrument keypad is disabled; thus, the operator cannot run a sample or
calibration locally at the 2700.
The host tells the 2700 to run a sample or a calibration. The samples may be assigned to run at
Station #1 (Cal Well), Station #2 (Test Tube Holder), Station #4 (Turntable) or Station #5
(Monitor Accessory). See page 9-14 for more information.
Calibrations are typically assigned to run at Station #1, but may be assigned to Station #2 or
even assigned to Stations #1 and #2 together in dual chemistry applications. The remote host
cannot change calibration station assignments; they must be made locally at the 2700
SELECT.