VX3 TO VX6 INSTALLATION MANUAL CONTROL AND MONITOR WIRING
PAGE 1.8.2 VERSION 1.0 2023-08-16
Remote Inputs
You can connect up to seven (7) remote inputs to the REMOTE I/O-A, 9-pin female D-sub connector on
the rear panel of the exciter/controller assembly (see VX3 to VX6 - Control/Monitor
Connections on page 1.8.11), which allow you to remotely control various operational characteristics
of the transmitter. Each input is factory set to a control at Nautel, but they are user-configurable using
the remote AUI.
See Table 1.8.1 on page 1.8.3 for a list of the preset inputs, their default functional descriptions and
their associated pins on the REMOTE I/O-A, 9-pin female D-sub connector. Refer to the VX Operations
and Maintenance Manual for instructions on changing the remote input settings. Unless otherwise
noted these inputs are only accepted by the transmitter if remote control is enabled. That setting can
only be made by a local user using the front panel UI. By default all remote inputs are active when a
ground (0 V) is applied. This can be configured in the remote AUI.
The external remote input circuits are optically isolated with internal opto-couplers. The opto-couplers
buffer and isolate the external circuits and prevent any unwanted transients from affecting the
transmitter.
The exciter PWB (A1) contains a jumper (E1) that lets you select an internal or external dc power supply
for all remote inputs. The default setting of the jumper is the transmitter’s internal 12 V supply (12V-OP,
pins 2 and 3). To use an external supply, place the E1 jumper on pins 1 and 2 (12 V) and connect an
external 12 V supply between pins 6 and 7 (ground). The switching circuits for the remotely controlled
functions must be the equivalent of a normally open (momentary) switch. Configure the switches to
operate as a single-ended input using the transmitter's 12 V dc supply as the source or as a differential
input using an external dc power supply (+12 V) applied to the J6A on the exciter PWB (A1).
Inputs are toggled between states by an active pulse unless otherwise noted. To ensure proper
operation, the active pulse duration should be a minimum of 250 ms. Refer to the Operations and
Maintenance Manual to see the various logic control options for remote inputs and outputs.
Remote Input Connections
Remote inputs 1 through 7, as required, connect to the pins of REMOTE I/O-A 9-pin female D-sub
connector on the rear of the transmitter. See
Table 1.8.1 on page 1.8.3 to determine the input pin
associated with each remote input, the default remote inputs and their functions.
Nautel provides a D-sub mating connector (Nautel Part # JS224) and connector shell (Nautel Part #
JS225) in the ancillary kit to facilitate customer connections to the controller, as applicable. The JS224
connector accepts 24-30 AWG wire.
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