Vishay DXP10, Руководство оператора, Страница: 5 / 42

1-1
SECTION 1. General Information
1.1 INTRODUCTION
1.1.1 General Description
The DXp-10 and DXp-15 (Figure 1-1) are
microprocessor based weight transmitters. DXp-
10/15 transmitters sum and convert the millivolt
signal from up to four strain gage type load cells
into a digital and/or analog voltage or current
signal (up to eight cells can be summed using
an external 308A summing unit). Bridge
excitation voltage is factory selectable for 10 or
15 volts. Units are available in NEMA 4, NEMA
4X or explosion proof enclosures for field
mounting. The unit operates from either 110 or
220 VAC at 50/60 Hz, and is equipped with
screw terminal connections for power input, and
serial/analog outputs. Set-up and calibration is
per-formed using three internal switches (see
SECTION III). Communication baud rate and
instrument address values are selected via a
bank of internal DIP switches (see SECTION
III).
The DXp-10 Transmitter performance
specifications are designed for inventory and
other static weighing applications where
moderate resolution and speed is required. The
DXp-15 Process Transmitter is equipped with
high performance circuitry that provides the
greater resolution and speed for dynamic
process applications. Externally and in regard to
set-up and operation, each model is identical
Using RS 485 serial communication protocol, up
to sixteen DXp transmitters can be networked to
an LCp-40, 41, or 42 Network Controller. The
serial format can also be configured to provide
point to point or network communication to a
customer supplied computer.
1.1.2 Standard Instrument
The standard instrument includes an RS 485
serial port with BLH Digi-System network or a
simplex output protocols, a four cell summing
circuit, 10 or 15 volt excitation, averaging filter,
and a NEMA 4 mild steel, painted enclosure.
Standard instruments are designed to meet
Class I, II, Division 2, Group A-G hazardous
location requirements and are optionally
available with FM and CSA approvals and
certifications.
1.2 OPTIONS
1.2.1 Mounting Options
For corrosive, hose down, or sanitary
environments, a NEMA 4X stainless steel
enclosure is available. An explosion proof
enclosure is available for Class I, II, Division 1,
Group B-G locations. Note: BLH 404 or 405
Intrinsic Safety Barriers must be specified for
weigh systems located in a Division I area.
Figure 1-1. DXp-10 Weight Transmitter
1.2.2 Optional Terminal Computer
Interface.
The terminal/computer interface option provides
a simple mnemonic half-duplex ASCII
communications protocol via a built-in macro
language consisting of 1 to 3 character command
strings (reference Table 4-3).
This powerful feature allows direct keyboard
control (using easily remembered commands) of