Page 2-2 VR-Link Technical Instruction Manual
Issue 0.6 Section 2 Pre-install, Installation, Setup & Configuration
2.3.1 Mounting in a Cabinet
Panel mounting screws are provided in the
ancillary kit.
2.3.2 Electrical Power
The VR-Link has an input voltage range of
100 - 240 V ac @ 1.2 A.
NOTE
The VR-Link ancillary kit contains an ac line
cord (Nautel Part # JN50). The user may be
required to replace the connector end.
2.3.3 Installing Interconnect Wiring
Install the wiring between the VR-Link and the
transmitter system as described in 2.3.3.1
through 2.3.3.3, noting the following:
• Connections between the VR-Link and
external remote ECMPs are to be made
using a shielded twisted pair cable (STP),
16 to 24 AWG. Cat5 (STP) cable is
recommended although other cable can
be used. Recommended cabling specs
for RS-485 have a shunt capacitance of
16 pF/ft. and 100 Ω characteristic
impedance. Maximum cable length for
RS-485 is typically listed as 4,000 ft
(1,219 m), but should be kept less than
3,280 ft (1,000 m) to ensure reliability.
Repeaters can be used if needed.
• Cables should also pass through a ferrite
toroid (not provided) a minimum of two
turns near the VR-Link.
2.3.3.1 VR-Link/ECMP Connection
The VR-Link has available connections for
up to three external ECMPs and one internal
ECMP.
All external ECMPs are connected to the
back of the VR-Link at locations ECMPA,
ECMPB and ECMPC using removable mini-
plugs (Nautel Part # JU59). See Figure 2-1
for a connection diagram.
NOTE
Do not connect any external ECMPs until
requested in paragraph 3.4.2.
The optional internal ECMP is connected to
the serial interface board (A1) internal to the
VR-Link. See Figure 2-2 for a connection
diagram.
While the VR-Link provides a serial
communication interface between the
ECMPs and the transmitter, parallel
communication on the ECMP is available to
further expand the ECMPs’ capabilities.
Connection to the internal ECMP for parallel
control and monitoring is made using 25-pin
D-sub connectors fed through the back of
the VR-Link. Refer to the ECMP Technical
Instruction Manual for further details on this
type of connection.
NOTE
Each external ECMP requires its own power
supply (Nautel Part # UG59) found in the
ECMP ancillary kit (Nautel Part # 195-5165).
Refer to the ECMP Technical Instruction
Manual for further information.
1 – INT BUS +
2 – INT BUS –
3 – GND
CONNECTIONS
Back of VR-Link ECMP (A/B/C)
ECMP (A/B/C) – 1 TB1–6
ECMP (A/B/C) – 2 TB1–5
ECMP (A/B/C) – 3 TB1–4
Figure 2-1: VR-Link/ECMP External
Connections