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Wireless Sensor Interface A720 (addIT™)

Additional Issues Related to Type Approval Testing

The test is performed by entering at the terminal prompt the command

: the base

and/or remote station must answer with the RF in and out values. If no answer is

received after several seconds, then retry the command. If still no answer is received,

then check with a scope on TP2 if the digital data is present (on receive); if not avail-

able, check U8:C and the parts around it. In addition, a radio receiver tuned on the

operating frequency can also supply a rough indication whether the receiver or the

transmitter are defective.

3.4. Additional Issues Related to Type Approval Testing

This chapter is intended for the bodies (laboratories) performing the tests required

to obtain a Test Report.

3.4.1. Controlling the Unit

The unit under test can be controlled by means of the special serial cable supplied by

Adcon Telemetry connected to a PC (e.g. a laptop) on one side and the

POWER

con-

nector of the unit on the other side. In order to switch the unit in various modes of

operations, a simple communications terminal program will sufﬁce (e.g. Terminal or

Hyperterminal in Windows, or Kermit under other platforms). The most important

commands used are

XMIT

and

SET FREQ

. For a list of all supported commands and

the parameters they expect, see also “Supported Commands” on page 39. For addi-

tional details on how to conﬁgure your terminal program, see “Setting-up the De-

fault Parameters” on page 13.

3.4.2. External Power Supply

In order to test the unit over the speciﬁed supply range, a special power cable is sup-

plied by Adcon Telemetry. This cable must be connected to the

POWER

connector of

the unit before the serial cable. The two wires with banana plugs can then be connect-

ed to an external variable power supply: the red plug to plus and the black one to

minus. However, before doing this, the internal battery must be disconnected. Here

is how:

• Open the lid by unscrewing the four screws in the corners of the addIT box;

• Gently remove the lid (the battery is fixed on the lid and is connected to the

electronics board by means of two wires);

• Remove the battery’s plug from the PCB connector;

• Mount the lid back, taking care that the rubber gasket sealing the box is not

out of its place;

• Screw the four screws back, applying a moderate force.

Note: If the rubber gasket is not properly mounted, the unit loses its IP65 environmental protection.

In addition, certain radiated limits cannot be guaranteed.