VULCAN Technical Manual
Connectors, LEDs and jumpers
© 2007 Eurotech Ltd Issue D
49
Jumpers
There are two user jumper headers on the VULCAN. They are summarised in the
following table and their use is described below:
Connector
Function
Jumper details in section…
JP1 RS422/485
selection
, page
JP2 Supercap/battery
selection
, page
JP1 – Jumper header
The user selectable jumper header JP1 is used to choose between RS422 and RS485
options, and termination resistor options. For more details, see
. The default position of the jumpers are shown in the following
diagram:
The following tables describe the jumper locations in more detail:
A5-B5 Description
(RS485 TX/RX) RS422 TX line
termination resistor (120
Ω
) connected.
Only fit if the VULCAN is at the end of
the network.
(RS485 TX/RX) RS422 TX line
termination resistor (120
Ω
)
disconnected.
Default setting:
A5 B5
A5
B5
5
4
2
1
3
JP1 default
jumper locations
A
B