Antenna i/o connector – Research Concepts RC2500 User Manual
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RC2500 Antenna Controller
Appendix I
Replacing the SA 8840 Controller
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas • 66218-9680 • USA
www.researchconcepts.com
Antenna I/O Connector
J7, located to the right of J4, is a DB-25 plug that acts as the Antenna I/O connector.
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. The individual pin definitions are shown in the table
below.
Pin #
Description
1
Azimuth CW limit input, 24VDC low current, (0.4V = CW Limit reached)
2
Polarization CW limit input, 24VDC low current, (0.4V = CW Limit reached)
3
Elevation Down limit input, 24VDC low current, (0.4V = Down Limit reached)
4
Pedestal_Override input, 24VDC low current, (+24V=RC2500 is disabled)
5
Azimuth Drive Fault input, 24VDC low current, not used (to be jumpered to +24VDC)
6
not used
7
not used
8
not used
9
not used
10
+24VDC to be jumpered to AZ Drive Fault line J7 pin 5
11
Polarization Enable output, open collector, 700mA sink. (0.4V = POL move)
12
Elevation Direction output, open collector, 700mA sink. (0.4V = Direction UP)
13
Elevation Enable output, open collector, 700mA sink. (0.4V = EL move)
14
Polarization CCW limit input, 24VDC low current, (04V= CCW limit reached)
15
Elevation Up limit input, 24VDC low current, (0.4V=UP limit reached)
16
Azimuth CCW limit, 24VDC low current, (0.4V=CCW limit reached)
17
not used
18
Elevation Drive Fault input, 24VDC low current, not used (to be jumpered to +24VDC)
19
Intercom, not used
20
Power Supply Common, (Referenced to the A.I.U. Loop Supply)
21
Azimuth Enable output, open collector, 700mA sink. (0.4V = AZ move)
22
Spare, not used
23
+24VDC to be jumpered to EL Fault line, J7 pin 18
24
Polarization Direction output, open collector 700mA sink. (0.4V = POL CW)
26
Azimuth Direction output, open collector, 700mA sink. (0.4V = AZ 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.