connecting serial cables
DTP170 Installation Manual Rev C.docx
5
Serial Cable Connections
There is one RS485 port for DyNet
®
signals, in
the form of a RJ12 socket, on the front, which is
used for the temporary connection of a PC or a
Portable Programmer (DPP601). There are data
terminals on the rear, for permanent connections.
The recommended cable for connections to the
serial port is screened, stranded RS485 data
cable with three twisted pairs. Recommended
cable types include:
Belden:
9503
Dynalite:
DYNET-STP-CABLE
Garland:
MCP3S
Hartland:
HCK603
M&M Cable:
B2003CS
M&M cable:
B9503CS
Multicables:
AWM E120236 2092 20
RS Components: 368-687
One pair is paralleled for GND, one pair
paralleled for +12V, and one pair used for DATA
and DATA.
Recommended
Cable Colour Coding
Green/White pair:
paralleled for GND
Orange/White pair:
paralleled for +VE
Blue/White pair:
Blue for DATA +
White for DATA -
The colour-coding scheme used is not critical, as
long as the same scheme is used throughout the
installation. The shield should be terminated in
the “SHIELD” terminal if present, otherwise it
should be terminated to the metal chassis of
electrically earthed devices, and looped through
on devices that are not electrically earthed.
Serial Cable Connecting Method
The recommended connecting method is to
‘daisy chain’ devices (starting at the first device,
then looping in then out of devices, with a single
cable terminating at the last device. There
should not be any spurs or stubs, and only the
first and last device should terminate one cable.
All other devices should terminate two cables).
Devices may be wired in any order. The Data
Cable should be.
A data cable that is
Connect D
ata Cable in a ‘Daisy Chain’
RJ12 Socket Connections
Serial Cable Permanent Connections
