78
83507013 Rev G
7.4.2 Multi Power Supply Connection to RS232 or RS485 Bus
Up to 31 units can be connected (daisy chained) to the RS232 or RS485 bus. The first
unit connects to the controller via RS232 or RS485 and the other units are connected via
the RS485 bus.
a) First unit connection: Refer to Section 7.4.1 for connecting the first unit to the
controller.
b) Other units connection: The other units on the bus are connected via their RS485
interface.
Refer to Figure 7-5 for typical connection.
Set rear panel setup switch SW1-6 to its UP position.
Using the Linking cable supplied with each unit (refer to Fig. 7-6), connect each
unit OUT connector to the next unit IN connector.
It is recommended when using ten or more power supplies in Daisy-chain system
to connect a 120ohm
resistive termination at the last unit’s RS485 OUT
connector.
120ohm, 0.5W between TXD+ and TXD-
120ohm, 0.5W between RXD+ and RXD-
8 PIN Connector (IN)
PIN Connector (OUT)
PIN NO.
NAME
PIN NO.
NAME
HOUSING
SHIELD
HOUSING
SHIELD
1
SG
1
SG
6
TXD-
6
RDX-
3
TXD+
3
RXD+
5
RXD-
5
TXD-
4
RXD+
4
TXD+
2
SPARE
2
SPARE
Fig.7-6:
Serial link cable with RJ-45 shielded connectors (P/N: GEN/RJ45)
NOTE
Pins 7 and 8 must not be connected.
Pins 1 through 8 are reversed from the CAT 5 cable standard.
