
T400 Controller Facilities Manual
667/EB/20200/000 Page 9-7 Issue 9
9.3.2 Summary of Control and Reply Bits
Control Bits
Section Bit designation Title
(a) DX Demands - Common
D1, D2 etc. Demands - Stage
(b) F1, F2 etc. Forces
(c) SF1 and SF2 Switch Facility
(d) SO Solar Override
(e) SG CLF Group Synchronisation
(f) LO Lamps On / Off
(g) LL Local Link Inhibit
(h) FM Fall Back Mode
(i) TO Take Over
(j) TS RTC Set to stored value
(k) TS1 RTC Synchronisation
(l) TC Transmission Confirm
Reply Bits
Section Bit designation Title
(a) G1, G2 etc. Stage Confirm
(b) DF Detector Fault
(c) SC1 and SC2 Switch Facility Confirm
(d) GR1 First Group Confirm
(e) CS CLF Group Sync. confirm
(f) SD1, SD2 etc. Stage demand confirm
(g) FC Fall Back Confirm
(h) HC Hurry Call Confirm
(i) MC Manual Control Mode
RR Remote Reconnect
(j) CF Controller Fault
(k) LE Lamps Off
(l) CC RTC Sync. Confirm to Stored Value
(m) CC1 RTC Sync. Confirm
(n) TOR Take Over Confirm
(o) SC Solar Override Confirm
(p) TF Test Facility
(q) FR Signals Flashing
(r) LC Local Link Inhibited
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