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Connection to the USB port of a com‐
puter
Polarisation and termination of the
RS485 bus
Communication programming instructions
Note the cabling of the bus system.
1
Fig. 55: Connection to the USB port of a computer
Blue (terminal no. 3):
White (terminal no. 4):
Black (terminal no. 5):
Configuration: All switches (1) to "ON".
1.
Use a 3-lead cable designed appropriately for use for voltage
and power.
2.
Guide the cable through the cable gland.
3.
Lead AA (no. 3) of the USB/485 converter to RS485 (A) (31).
4.
Lead BB (no. 4) of the USB/485 converter to RS485 (B) (32).
5.
Lead C (no. 5) of the USB/485 converter to DWR (C) (18)
6.
Tighten the cable gland to make a seal.
A USB/RS485 converter is recommended for connecting the
device to a computer. Please read the documentation on the con‐
verter to connect it up.
Reference
INF1021
The devices can be networked noting the order of the cables (par‐
allel wiring).
For safety reasons, it is essential that the device is de-energised
before opening the housing to switch the microswitches.
Name
USB ➨ 485 converter
A3019
59
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