Research Concepts RC2500 - Manual (Page 24)

RC2500 Antenna Controller Chapter 3 Installation/Setup 17
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas • 66218-9680 • USA www.researchconcepts.com
3.3.2.2 9135 Version Connections
Antenna I/O Connector
J7, located to the right of J4, is a DB-25 plug that acts as the Antenna I/O connector. This connector acts
as the antenna motion control port of the RC2500 when connected to the Harris 9135 A.I.U.
The port consists of six solid-state low-side relay drivers rated at 700mA sink each. The maximum
allowable voltage is +27VDC on these drivers. A single set of dry relay contacts control the application of
24V the loop supply (INTEST). Two modest-current, high-side drivers are used to transmit the PWM
source voltage to PWM drive output lines that become speed signals to the Azimuth and Elevation drives.
In addition to the aforementioned drivers, this port supports eleven 24 VDC, low current, status inputs
with a common return path. The individual pin definitions are shown in the table below.
Pin # Description
1 Azimuth CW limit input, 24VDC low current, (0V = CW Limit reached)
2 Polarization CW limit input, 24VDC low current, (0V = CW Limit reached)
3 Elevation Down limit input, 24VDC low current, (0V = Down Limit reached)
4 Remote Status input, 24VDC low current, (0V=RC2500 is disabled)
5 Azimuth Drive Fault input, 24VDC low current, (0V= Drive Fault)
6 Azimuth PWM Drive Source, 24VDC high current
7 Azimuth PWM Drive output, 24VDC high current (High duty cycle = Fast AZ Speed)
8 Elevation PWM Drive output, 24VDC high current
9 Elevation PWM Drive Source, 24VDC high current (High duty cycle = Fast EL Speed)
10 INTEST input, 24VDC high current, from A.I.U.
11 Polarization CW Drive output, open collector, 700mA sink. (0.4V = move CW)
12 Elevation Direction output, open collector, 700mA sink. (0.4V = Direction Down)
13 Elevation Drive Reset output, open collector, 700mA sink. (0.4V = EL Drive Reset)
14 Polarization CCW limit input, 24VDC low current, (0V= CCW limit reached)
15 Elevation Up limit input, 24VDC low current, (0V=UP limit reached)
16 Azimuth CCW limit, 24VDC low current, (0V=CCW limit reached)
17 Low Temperature Alarm input, 24VDC low current, (0V=cold temp point reached)
18 Elevation Drive Fault input, 24VDC low current, (0V= Drive Fault)
19 Intercom, not used
20 Power Supply Common, (Referenced to the A.I.U. Loop Supply)
21 Azimuth Drive Reset output, open collector, 700mA sink. (0.4V = AZ Drive Reset)
22 Spare, not used
23 INTEST Return path output, 24VDC high current dry contact closure
24 Polarization CCW Drive output, open collector 700mA sink. (0.4V = move CCW)
25 Azimuth Direction output, open collector, 700mA sink. (0.4V = Direction CW)
In addition to providing power to A.I.U. circuitry, the Voltage on pin 23 is used to power the electronic
components that reside on the A.I.U.-side of the opto-isolation barrier. When no power is present at
Intest (which is passed to Intest return when the controller is in a non-error condition), this pin must still
be powered by between +15 and +28V (and its return line connected to “-“) in order for the RC2500 drive
system to function.