User Guide
2 - 10
Signal Processor
LMG MkII
Fig. 2-17 Correct cable wiring arrangement
Keep wire length as
short as possible
Ensure cable's outer insulation
is held in clamp bar/cable tie
Clamp bar
The maximum cable lengths are, to a great extent, dependent on baud rate
and cable type. Generally a lower baud rate will give reliable communications
over a longer length of a given cable type.
RS485
9600 baud, 1000 m when using the cable recommended below,
with correct cable terminations.
Recommended 1000 m cable for RS485:
•
2 pairs individually screened
~50 ohms characteristic impedance, <= 55 ohm/km
<100 pf/m core to core
<200 pf/m core to screen
2.3 Cable Connector Assembly
The cable connectors for the rear panel of the processor are included in the
processor package. Each cable connector must be correctly wired with the
appropriate cable before the processor is used (Refer to Section 2.2 for the
cable schedules). A ‘write on’ label is included in the connector for your use.
To wire up the connector.
1) Make a note of the connector’s orientation in the rear panel of the
processor.
2) Unclip the two halves of the connector shell to reveal the terminal block
and the cable tie/clamp bar.
3) Wire up the connector, remembering the correct orientation of the plug,
in accordance with the relevant cable schedule (see Section 2.2).
NOTE
Keep wire length as short as possible, especially for any screen
connection.
4) Ensure that the cable outer insulation is held in the clamp bar/cable tie
at the connector and tighten the clamp bar screws/cable tie. Refer to
Fig. 2-17.
Summary of Contents for LMG MkII
Page 6: ...INTRODUCTION 1 ...
Page 10: ...INSTALLING THE PROCESSOR 2 ...
Page 14: ...User Guide 2 4 Signal Processor LMG MkII Fig 2 4 LMG MkII Electrical System Overview ...
Page 22: ...3 USING THE PROCESSOR ...
Page 44: ...TIME FUNCTION PROCESSING 4 ...
Page 50: ...SERIAL COMMUNICATIONS 5 ...
Page 62: ...Signal Processor LMG MkII Blank ...
Page 63: ...EXTERNAL I O MATHS FUNCTIONS 6 ...
Page 64: ...Signal Processor LMG MkII Screws A Fig 6 1 Location of screws on back panel Screws A ...
Page 88: ...MAINTENANCE 7 ...
Page 92: ...User Guide 7 4 Signal Processor LMG MkII Fig 7 3 USB Export Data option ...