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SECTION 2
2.1
Introduction
2.1.1
This section describes the unpacking and inspection, reshipment, and installation
requirements of the 2251A.
2.2
Unpacking and Inspection
2.2.1
Before unpacking the counter, check the exterior of the shipping carton for any signs
of damage. All irregularities should be noted on the shipping bill. Remove the
instrument from its carton, preserving the factory packaging as much as possible.
Inspect the counter for any defect or damage. Notify the carrier immediately if any
damage is apparent. Have a qualified person check the instrument for safety before
use.
2.3
Reshipment Instructions
2.3.1
Use the original packing if it is necessary to return the counter to Racal Instruments
for calibration or servicing. The original shipping carton and the instruments plastic
foam will provide the necessary support for safe reshipment. If the original packing
is unavailable, wrap the counter in plastic sheeting and use plastic spray foam to
surround and protect the instrument. Reship in either the original or a new, sturdy
shipping carton.
2.4
Interrupt Level and Logical Address Setting
2.4.1
The Interrupt Level and Logical Address of the 2251A are not software controllable.
Carry out the following procedure if it is necessary to change either the Logical
Address or the Interrupt Level.
2.4.2
To set the interrupt level of the 2251A, set switch S1 to the binary equivalent of the
interrupt level selected. Interrupt levels between 0 and 7 inclusive are permitted. The
OFF switch positions on S1 correspond to binary 1. The 2251A is shipped from the
factory with the interrupt level set to 02.
2.4.3
To set the logical address of the 2251A, set switch S2 to the binary equivalent of the
logical address selected. Logical addresses between 1 and 254 (FF
The OFF switch positions on S2 correspond to binary 1. The 2251A is shipped from
the factory with the logical address set to 03. Refer to Figure 2-1 for an illustration
of the location of the switches and their default settings.
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INSTALLATION
) are permitted.
HEX
2-1
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