Model: DDU-TM-44/46 or DDU-44/46
Doc. Ref. no. : - m06c/om/101
Issue no. 04
User’s Manual
Page 20 of 36
5.2 How to connect wires
Before carrying out wiring, turn off the power and check that the cables to be connected are not alive
because there is a possibility of electric shock.
NOTE:
All wiring must confirm to appropriate standards of good practice and local codes and
regulations. Wiring must be suitable for Voltage, Current and temperature rating of the system.
Provide power from a single-phase instrument power supply. If there is a lot of noise in the
power line, insert an insulating transformer into the primary side of the line and use a line filter on
the secondary side. Do not place the primary and secondary power cables close to each other.
Use repeater after each set of 32 instruments connected in RS-485 Communication.
Unused terminals should not be used as jumper points as they may be internally connected,
which may cause damage to the unit.
Use >250V-1Amp Cable for Power Supply.
Supply voltage must be below maximum voltage rating specified on the label.
Figure 19
RS232 Connection Details
Figure 20
RS485 Connection Details
Note: - Consider RS485 Connection Detail for DDU-TM-44/DDU-44 or DDU-TM-46/DDU-46
same as above figure 15
In case of RS-232 Output base master unit, external RS-232 to RS-485 Connector required, and
it will be connected direct in case of RS-485 output from Master.
