ADB Safegate L-854, User Manual

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4.0 Theory of Operation
This subsection describes the L-854 Radio Control Equipment theory of operation. Refer to Figure 2 .
4.1 General
The L-854 has three major components: the Radio Control Board (44A6748), the Radio Display Board (44A6746), the Radio
Power Supply Board (44A6749), and the Radio Relay Board (44A6747).
Figure 2: L-854 Main Assembly
4.2 Terminal Block
See Table 4 . The L-854 Radio Control Equipment terminal block is used to interface an air-to- ground Radio Control
Equipment with an L-821 control panel, interface panel or direct to an L- 828 constant current regulator (CCR). The CCR
control voltage can be 48 V dc or 120 Vac.
Table 4: Terminal Strip Interface
TERMINAL STRIP # DESCRIPTION
1 I/O Common
2 General I/O (not used)
3 Command Decode Disable (see Interfacing the Radio Controller )
4 ACom – voltage common input for A relays
5 A7clk – Output of A7 (7-click) Relay
6 A5clk – Output of A5 (5-click) Relay
7 A3clk – Output of A3 (3-click) Relay
96A0390, Rev. K, 2019/02/01 13
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