Multi Power Supply Connection To Rs232 Or Rs485 Bus - Delta D750 User Manual

User Manual
D750
DC Power Supply

4.2.4.2 Multi power supply connection to RS232 or RS485 bus

Daisy-chain up to 31 units can be connected to RS232 or RS485 bus. The first unit
connects to the controller via RS232 or RS485 and the other units are connected with
RS485 bus,
1.First unit connection: Refer to section 4.2.4.1 for connecting the first unit to the
controller.
2.Other units connection: The other units on the bus are connected via their RS485
interface.
3.Refer to Fig. 4-7 for typical connection.
-Set rear panel setup switch SW1-6 to it's UP position
-Using the Linking cable supplied with each unit (refer to Fig. 4-8), connect each unit
OUT connector to the next unit IN connector.
* It is recommended when using several power supplies in Daisy-chain system to connect
a 120Ω resistive termination at the last unit's RS485 OUT connector.
120Ω, 0.5W between TXD + and TXD -
120Ω, 0.5W between RXD + and RXD -
59 │ www.deltaww.com
CN1 (DB-9)
PIN NO. NAME
HOUSING SHILED
9 TXD −
8 TXD+
1 SG
5 RXD −
4 RXD+
Fig. 4-6: RS-485 cable with DB9 connector
Fig 4-7: Multi power supplies RS232/485 connection
CN2 (8 PIN CONNECTOR)
PIN NO. NAME
HOUSING SHIELD
6 RXD −
3 RXD+
1 SG
5 TXD −
4 TXD+
REMARKS
TWISTED PAIR
TWISTED PAIR