Model: DDU-24/26
Doc. Ref. no. : - m06bom101
Issue no. 09
Page 18 of 51
User’s Manual
Figure 17 Connection on Terminal plate of DDU-26 (NTP) Wall / Brick Wall Mount
5.1.2 Terminal connection detail for DDU-24/26 Enclosure
Table 3 Terminal Connection Detail of Enclosures
No.
Terminal Type
Description
1
MSTB Conn.
4 pin for RS232 or
RS485
RS232 or RS485 serial data input
For RS232
1 - TX
2 - RX
3 - GND
4 - GND
For RS485
1 - A+
2 - B-
3 - GND
4 - GND
2
MSTB Conn.
3 pin for Aux. PWR.
5 - L
6 - N
7 - Earth
3
RJ45 Socket for
NTP
For RJ45 based Ethernet
connection for NTP[Network Time
Protocol]
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.
