TM8260 Installation and Programming Guide
Installing a Dual-Radio System
21
© Tait Limited
October 2014
3.4
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,
■
assemble the body interfaces,
■
mount the radio bodies, then
■
install the radio connecting cable.
Removing Link J4
Every body remote interface (TMAC31-0T) is manufactured, by default,
with a 120
Ω
termination resistor across the RS485 signal lines. The control
head remote (TMAA03-03) also has this termination.
This termination is required at the ends of an RS485 network. In the case
of a TM8260 dual-radio system, the radio body with the two connections
(to the control head and to the other radio body) is a node on the network
and must not have this termination.
To remove this termination, use your fingernail (or similar) to remove the
jumper (shorting link) J4. Link J4 is located between the two 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)
in
), 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 3.5
Location of link J4
link J4
RJ45 connectors
