TM9456 Dual-Radio Installation and Programming Guide
Installing a Dual-Radio System
21
© Tait Limited
July 2016
2.4
Installing the Radio Bodies
To prepare and install the radio bodies, you must:
■
remove link J4 from the radio body interface that will be connected to
the control head. This is interface T02-00081-BBAA that is fitted to the
UHF radio.
■
assemble the body interfaces,
■
mount the radio bodies, then
■
install the radio connecting cable.
2.4.1
Removing Link J4
Each body remote interface is manufactured, by default, with a 120
Ω
termination resistor across the RS485 signal lines. The control head remote
also has this termination.
This termination is only required at the ends of an RS485 network. In the
case of a TM9456 dual-radio system, the UHF radio body with the two
connections (to the control head and to the other radio body) is a node on
the network and must have this termination removed.
To remove this termination, use your fingernail (or similar) to remove the
jumper (shorting link) J4. Link J4 is located on the far side of the PCB,
away from the RJ45 connectors (see
), and can be removed
without removing the PCB.
This must only be removed on the body remote interface connected to the
control head (item
1)
), and can only be removed
when the interface is separate from the radio body. If the interface has
already been installed, see
“Removing the Body Interface” on page 22
.
Figure 2.2
Location of link J4
link J4
RJ45 connectors
