Thales 421 - Page 192

LLZ 421
Repair Operation and Maintenance
ILS 420
6−50 Ed. 01.10SOAC
SWITCH POSITION DEFINITION REMARKS
SW2 Switch bank SW2 selects the RSCU commu-
nication method (which also affects the LCP/
ECU protocol). The setting of SW2 is installa-
tion dependent.
Depends on application
SW2 /1
/2
/3
/4
/5
/6, /7, /8
/6
/7, /8
/7
/6, /8
/8
/6, /7
closed
open
closed
open
closed
open
closed
open
closed
open
closed
open
closed
open
closed
open
RSCU/ECU communication hardware hand-
shakes enabled
RSCU/ECU communication hardware hand-
shakes disabled
Undefined LCP communication PLD option
−
Undefined redundant control PLD option
−
HW interlock to opposing runway enabled
HW interlock to opposing runway disabled
RSCU COMM to ECU
RSCU/RSCE COMM to LCP
RSCU address A2, A1, A0 respectively:
A2
A1
A0
Relevant only if SW2/5 closed
Default setting
Default setting
−
Default setting
−
Default setting
−
−
Default setting (standard ILS)
Relevant only if SW2/5 closed
RSCU address A2
−
RSCU address A1
−
RSCU address A0
−
3b Executive Control Unit (ECU) 120571−0003 3 of 3
NOTE: If the LLZ or GP installation shall be equipped with the ECU Ref. 120571−0003, e.g. for replacement, it is allowed to use both
the −0001 or 0002 and the new −0003 version together in one system. But, to get the benefit of the −0003 (e.g. advanced MIT−
test) it is recommended to replace and use the −0003 in both LLZ and GP of a runway system; this is two ECU −0003 for LLZ
and GP each even there is only one ECU to be replaced.