Comtech EF Data HPCST-5000 - Manual (Page 70)

Single Thread System Installation High-Power TWTA Satellite Terminals
2–24 Rev.1
2.3.4.1.4 Output Voltage Circuits
+15V (Pin E) 15V DC at 100 mA is available for external use or for
powering the pull-up resistors for the control and status
signals (Pin Y).
+24V (Pin V) 24V DC at 100 mA is available for external use.
2.3.4.1.5 Control/Status Ground Isolation
Refer to Figure Chapter 2-4 for pinout information. For instructions where M&C ground
isolation is not required, the internal +15 VDC supply voltage can be used to power the
control and status line.
Use the internal supply as follows:
1. Connect Pin Y (External Voltage) to Pin E (+15 VDC).
2. Connect Pin W (Control/Status Return) to Pin N (Analog Signal Return).
Note: For installation where M&C ground is required, or where long cables must be used
in an electrically noisy environment, an external supply can be used to power the control
and status lines.
Use an external supply to fully isolate the M&C grounds as follows:
1. Connect Pin Y to an external supply voltage (+5 VDC minimum, +15 VDC
maximum).
2. Connect Pin W to the external supply return.
Note: The EFData system harness is pre-wired and has no special control/status ground
isolation required.