The material contained in this document is the property of Electronics & Innovation Ltd., it is
subject to change without notice.
August 2012
6
Revision F
2.3.2 Front Panel Display
The 1140LA front panel has a passive LCD display designed for simplicity and
ease of use. During initialization, the LCD shows the software revision. After the
amplifier is initialized, the LCD indicates Forward Power, Reflected Power, and
amplifier status (see figure 2.1).
Pf:___W Pr:___W
Status:________
Figure 2.1 : Front Panel Display
Where Pf refers to forward power, Pr refers to reverse power, and Status
indicates “OK” unless there is a fault condition, such as:
Overheat (heat-sink temperature is too high for reliable operation)
PSU fault (internal fault in the main switching power supply)
In the event of a fault, the unit may be reset by cycling the power. In the case
over an over temp fault, ensure that the air inlet and out let are not restricted. If
the fault persists, please contact Field Service.
2.3.3 RS 232 Interface
The 1140LA features a standard RS-232 serial interface suitable for connection
to a PC or host system. The communication protocol is extremely simple to
facilitate readback and control with readily available terminal programs such as
Hyperterm. The RS-232 link has the following parameters:
Baud rate:
19200
Data bits:
8
Parity:
none
Stop bits:
1
Flow control: none
An example configuration using HyperTerminal on a PC is shown in figure 2.2.