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Chapter 8. Remote Transponder Unit (RTU)
An RTU is a remotely located cabinet containing slave modules controlled by a 4100ESi master panel. The RTU
uses a TIC, not a CPU card. A TIC provides data interconnection between the 4100ESi host panel and remote
locations. It is possible to fit a display to the RTU if required. An RTU is supplied in 8U, 15U or larger cabinets.
This section describes 8U and 15U RTUs. For information about larger cabinets see page 48.
The 15U RTU has 4 PDI blocks on the backplane. One PDI block is used by the TIC. Any PDI cards can be fitted
in the vacant blocks. Use an ME0516 Dual PDI bracket to fit additional PDI cards if necessary. See Chapter 4,
Using the Dual PDI bracket, for more information about the Dual PDI bracket.
A LPS 10A supply is supplied with the 15U RTU. There is battery space at the bottom of the cabinet for at least
33Ah batteries. The LPS provides three NAC outputs, four relay outputs, three controllable 24V outputs and
two supervised inputs. This reduces the need for additional cards.
The 8U RTU is supplied with an APS and a TIC, leaving room for up to four additional PDI blocks, or two legacy
slots, or a combination. The TIC occupies one PDI block. The cabinet provides limited space for batteries.
In the 8U RTU, the PSU can be one of the following:
⋅ An APS using PDI style mounting, and providing three NAC outputs, three AUX supplies, four relay outputs
and two inputs.
⋅ Using an ME0470 5A unit legacy style mounting with the TIC wired to monitor the Fault output.
Mounting the cabinet
The recommended cabinet wall fixing is M8 screws or studs.
Mount an RTU without a display at any height. RTUs with displays must adhere to the mounting heights
specified in AS1670.1.
Figure 54 and Figure 55 show the recommended path for connection of mains power wiring.
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