Address code
Address (Hex)
0000 30
0001 31
0010 32
1110 3E
1111 3F
ADD SEL
Allows the user to select the method of setting the serial communications
device address. The address can be set either in hardware using the ADD 0
to ADD 3 lines above, or in software over the serial interface itself (see
section 6.1.12).
Note:
With hardware address selection, the only valid baud rate is 9600.
+15 V = Software selection, Not connected = Hardware selection.
This feature allows the user to return to a known address, in the event of lost
contact with the unit, by simply cutting the ADD SEL to +15V link. The
amplifier is supplied with no links, hence the interface is set to:
Address 30H
Baud
rate
9600
CTRL O/R
Allows the user to select the ‘black box’ mode. When selected, as soon as
the mains supply is applied to the unit, the warm-up state is entered and
subsequently the unit automatically enters the standby state. If the XMIT
control input is linked to GND the unit then enters the transmit state.
Switching the XMIT control input between GND and open circuit will switch
the unit between transmit and standby states. In addition, as the mains
supply is applied to the unit, the attenuator, if fitted (units with a D suffix to the
product type number), will be set to minimum attenuation. This feature
provides operation with the minimum of control connections. Whilst in this
mode, all indicator outputs and other control inputs excluding the XMIT
operate as normal.
+15V = Black box mode, Not connected = Normal mode.
5.2.7 Miscellaneous
Functions.
+15V
Auxiliary supply output of nom15V dc ± 5% at 100mA maximum.
Provides the user with a local low voltage output for use with type 3 user port
control inputs and other external control interface circuitry.
GND
Provides the ground return reference for many of the user interface lines.
RED SW1/2
Part of the redundant switch control facility, providing two waveguide switch
coil drive outputs. Each output is nom24V dc at 1.6A, pulsed for
100ms. An internal 1.8A current limit is provided along with flywheel diodes
for protection, further simplifying waveguide switch interface considerations.
RED SW 1 should be connected so that when asserted, the RF output from
the unit is switched to the antenna. RED SW 2 should be connected so that
when asserted, the RF output from the unit is switched to the dummy load.
RS TX +
Provides connection for a RS-485 or RS-422 interface allowing connection as
RS TX -
a slave to an asynchronous, half duplex, multi-drop, four-wire bus. This gives
TS RX +
This gives full remote control and monitoring of the amplifier as part of an
RS RX -
integrated system. The main features, protocols and operation of the serial
RS GND
are described in section 6.
2/4 BUS SEL
Allows a 2- or 4-wire serial bus.
+ 15V = 2-wire, Not connection = 4-wire.
Note:
For a 2-wire system, link pins b and d, c and e.
© e2v technologies (uk) limited 2010
DAS768892AA
Version
1,
page
22
