RC4500 Antenna Controller Chapter 3 Mechanical & Electrical Installation
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3.1.2.4 Antenna I/O
J7 is a 25 pin D-subminiature male receptacle used for Antenna I/O. This connector acts as the antenna
motion control port of the RC4500. This port consists of 9 optically-isolated, low-side transistor relay
drivers rated at 70mA sink each. Max voltage is +27 VDC on these drivers. Current is returned to the AIU
via the Drive Common line (pins 2, 5 and 8.) There are 4 additional unused relay drivers for future
expansion. In addition to these drivers, this port supports four 24 VDC, low current status inputs, two of
which (Emergency Stop and Maintenance) have isolated returns.
Pin #
1
Description
Azimuth CW command, pull-down drive, 70mA max sink (1.5V = move CW)
2 Drive Common (return path for AZ, EL and POL drive command lines)
3 Azimuth CCW command, pull-down drive, 70mA max sink (1.5V = move CCW)
4 Elevation Up command, pull-down drive, 70mA max sink (1.5V = move Up)
5 Drive Common (return path for AZ, EL and POL drive command lines)
6 Elevation Down command, pull-down drive, 70mA max sink (1.5V = move Down)
7 Polarization CW command, pull-down drive, 70mA max sink (1.5V = move CW)
8 Drive Common (return path for AZ, EL and POL drive command lines)
9 Polarization CCW command, pull-down drive, 70mA max sink (1.5V = move CCW)
10 Summary Limit input, 24 VDC low current (0V = Summary Limit active)
11 NC (future expansion for Azimuth Enable command)
12 NC (future expansion for Elevation Enable command)
13 NC (future expansion for Elevation Brake command)
14 Azimuth Drive Fault input, 24 VDC low current (0V = drive fault)
15 Elevation Drive Fault input, 24 VDC low current (0V = drive fault)
16 Emergency Stop status return
17 Summary Limit and AZ/EL Drive Fault return
18 Summary Limit and AZ/EL Drive Fault return
19 Emergency Stop status input, 24 VDC low current (0V = Emergency STOP)
20 NC (future expansion for Azimuth Brake command)
21 Azimuth Fast command, pull-down drive, 70mA max sink (1.5V = AZ Fast)
22 Elevation Fast command, pull-down drive, 70mA max sink (1.5V = EL Fast)
23 Drive Enable command, pull-down drive, 70mA max sink (1.5V = Drive Enable)
24 Maintenance status input, 24 VDC low current (0V = Maintenance – pedestal jogging)
<1>
25 Maintenance status return
<1> Maintenance Input – When current flows in the MAINTENANCE – MAINTENANCE RETURN circuit the controller assumes
that the AIU is able to accept drive commands from the controller. If current is not flowing in the MAINTENANCE –
MAINTENANCE RETURN circuit the controller disables antenna control and displays the ‘Maintenance’ alarm message.
This terminal also powers all of the RC4500’s isolated output drive circuits (AZ CCW/CW, EL DOWN/UP, POL CCW/CW, AZ/EL
FAST and DRIVE ENABLE.) 17 to 27 volts DC is required to power the controller’s output circuits. The current that powers the
output drive circuits flows out of the DRIVE COMMON terminals back to the AIU.
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