Technical Manual

Table Of Contents

Programming the Boards

3.1. Programming the Boards

This section will be completed later.

3.2. Setting-up the Default Parameters

The tuning procedure is not possible without ﬁrst conﬁguring some default param-

eters on each unit. This is done using a special serial cable connected between the

A720MB with an A720CA interface to a PC; in addition, a communication terminal

program (e.g. Hyperterminal, in Microsoft® Windows™ 95) is needed to send the

commands. The terminal program must be conﬁgured as follows:

• 19200 Baud

• 1 Stop bit

• No parity

• No protocol (neither hardware, nor software)

To check that the communication is operational, press the

ENTER

key: an

should

appear on the terminal screen. Using the

SET

command, following default parame-

ters must be pre-loaded (for more details on the meaning of the commands, consult

the section “The Terminal Task” on page 39):

SET OWNID 1

SET PMP 65 72

SET SLOT 900 3

SET RSSI 58

SET BL 432000000 450000000

SET FREQ 432000000 25000

The last two

SET

commands are valid for the units that will be trimmed for the low

band; for the high band, they must be replaced by:

SET BL 450000000 470000000

SET FREQ 450000000 25000

Note: The SET BL command sets the band limits, while SET FREQ sets the operating frequency;

before shipping and depending on the target country these two parameters may be changed.

The SET BL command must be issued always before the SET FREQ command.

3.3. Tuning

The tuning can be performed only after the units are programmed and the default

parameters are set, as described previously.

RxD

TxD

Ground

Battery

Ext Power