Rohde & Schwarz SU 4200 - Behavior in Case of Device Errors; Fig. 3.56 Inactive Device

Main/Standby Operation (1:1) R&S SU 4200
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3.6.4 Behavior in Case of Device Errors
This chapter
If an error or NOGO warning occurs on the "Main" radio, the "Standby" radio
will be activated via the TEST_OC line. The "Standby" device will
become active and switches the "Main" radio inactive by serving the cross-
connected *OFF line. The device pair is now settled in a stable state.
Even if an error or NOGO warning disappears on the inactive "Main" radio,
the "Standby" radio will stay active. In case there will be an error on the
active "Standby" device, a switchover to the "Main" radio could be done.
Device 1 "Main" Device 2 "Standby"
Display LED Display LED
Stable State after
booting
See Fig. 3.55
Active Device
VOP = active
GO = active
See Fig. 3.56
Inactive Device
VOP = inactive
GO = active
Error or NOGO
warning on
Device 1 after
main/standby
switchover
See Fig. 3.56
Inactive Device
VOP = inactive
GO = inactive
See Fig. 3.55
Active Device
VOP = active
GO = active
Fig. 3.59 R&S SU 4200 radio in local mode