Research Concepts RC2500 - Manual (Page 115)

108 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.