The following gives the binary and equivalent hexadecimal code of these discrete
lines.
Address code
ADD 543210 Address in Hex
000000 30H
000001 31H
000010 32H
""" "
111110 6EH
111111 6FH
ADD SEL Allows the user to select the method of setting the serial
communications interface. The address can be set either in
hardware using the ADD 0 to ADD 5 lines above, or in software
over the serial interface itself (see section 6.3).
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 the
software losing contact with the unit, by simply cutting the ADD SEL to +15 V link.
The amplifier is supplied with no links, hence the interface is set to:
address 30H
baud rate 9600
CTRL O/R This allows the user to select the ‘black box’ mode. When selected,
as soon as the mains supply is applied to the unit, the three minute
WARMUP mode is initiated and subsequently the unit automatically
enters the STBY mode. If the XMIT control input is linked to GND
the unit then enters the XMIT mode. Switching the XMIT control
input between GND and open circuit will switch the unit between
XMIT and STBY. In addition, as the mains supply is applied to the
unit, the internal digital electronically variable attenuator (DEVA) will
be set to minimum attenuation if fitted (units with a D suffix to the
product type number). 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.
+15 V = Black box mode, Not Connected = Normal mode.
5.2.7 Miscellaneous functions
+15 V Auxiliary supply output of nominally +15 V dc +5% at 100 mA
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.
HBN63xx-1, Issue 8, Page 25
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