Dishtronix, Inc.
Dx2400l1 instruction manual rev00.doc 06-10-18 5.14
Page 35/44
the RS485 / RS422-RX terminator. R216 is the RS422-TX terminator. The termination resistors
may be removed by soldering.
3.11.02
Interface Line Bias
RS422/485 has another feature called line bias. Line bias resistors pull the lines to a known state
and are generally installed at the bus master controller (PC computer) end. Dishtronix does not
install line bias resistors in this amplifier. Should they be required, use 750
Ω
0805 5% SMD
resistors. The RS422 TX line bias resistors are R217 and R219. The RS485/RS422-RX line bias
resistors are R213 and R215, all located on the main processor PCB located behind the front
panel.
As shipped from the factory, this amplifier is configured for full duplex RS422 communication.
•
Please note that when using the strongly recommended Dishtronix adapter for your
radio/ computer that NO internal changes to any of these resistors are necessary.
Consult Dishtronix technical support for further details.
3.11.03
Setting Remote Interface Power Options
The remote interface is optically isolated from the amplifier. As shipped from the factory, the
interface power is supplied from the rear panel 12V supply which is normally connected to the
+12V output of the transceiver AUX +12V jack.
It is possible to supply power to the remote interface from the 12V jack (default), from the
amplifier internal logic power supply, or externally from the 8 pin remote jack. Note that
interface power supply pins of the remote interface DATA are connected to whatever supply is
selected to run the interface! Refer to Figure 6 of Section 3.3 for connector information.
The following chart details the different power supply options for the interface:
INTERFACE
POWER
SOURCE
JP8 JP9 JP10 COMMENT
+12V IN Jack
(rear panel)
Factory default
short open
open
8 pin modular jack has transceiver power
present on pins V+ and V-. Interface is
optically isolated from amplifier.
Internal logic
power supply
open short
short
8 pin modular jack has internal logic supply
power present on pins V+ and V-. Interface
is not isolated from amplifier.
External Power
open open
open
8 pin modular jack must supply 8-15V of
power to interface on pins V+ and V-.
Interface is optically isolated from amplifier
JP8, JP9 and JP10 are located on the main processor PCB located behind the front panel. The
short is a 0
Ω
0805 SMD resistor (marked 000) that is installed by soldering. Note also that the
internal power connections to the 8 pin modular jack can be eliminated by removing RFC56 and
RFC60 if desired.
Summary of Contents for DX2400L1
Page 11: ...Dishtronix Inc Dx2400l1 instruction manual rev00 doc 06 10 18 5 14 Page 11 44 2 INSTALLATION...
Page 19: ...Dishtronix Inc Dx2400l1 instruction manual rev00 doc 06 10 18 5 14 Page 19 44 3 OPERATION...
Page 41: ...Dishtronix Inc Dx2400l1 instruction manual rev00 doc 06 10 18 5 14 Page 41 44 5 SERVICE...
Page 44: ...Dishtronix Inc Dx2400l1 instruction manual rev00 doc 06 10 18 5 14 Page 44 44 NOTES...