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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.
RS232/RS485
1
8
Fig. 7-6 Serial link cable with RJ-45 shielded connectors (P/N: GEN/RJ-45)
Pins 1 through 8 are reversed from the CAT 5 cable standard.
7.5.
Communication Interface Protocol
The address (ADR n) command must return an "OK" response before any
7.5.1. Data Format
Serial data format is 8 bit, one start bit and one stop bit. No parity bit.
7.5.2. Addressing
The Address is sent separately from the command. It is recommended to add 100msec
delay between query or sent command to next unit addressing. Refer to Section 7.7.3
for details.
7.5.3. End of Message
The end of message is the Carriage Return character (ASCII 13). The power supply
ignores the Line Feed (ASCII 10) character.
RS485
IN
OUT
POWER SUPPLY
POWER SUPPLY
#1
Fig7-5: Multiple power supply RS232/485 connection
L=0.5m typ.
PIN NO.
NAME
HOUSING
SHIELD
1
SG
-
6
TXD
+
3
TXD
-
5
RXD
4
+
RXD
Pins 7 and 8 must not be connected.
other commands are accepted.
83503001 Rev G
RS485
IN
OUT
IN
POWER SUPPLY
#2
#3
PIN NO.
NAME
HOUSING
SHIELD
SG
1
-
6
RXD
3
RXD
+
-
5
TXD
4
TXD
+
NOTE
NOTE
75
RS485
OUT
IN
OUT
POWER SUPPLY
#31
8
1
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