83-507-013 Rev. A
53
NOTE
The address (ADR n) command must return an “OK” response before
any other commands are accepted.
7.5.2 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.
1. First unit connection: Refer to Section 7.5.1 for connecting the first unit to the controller.
2. Other units connection: The other units on the bus are connected via their RS485 interface.
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.
7.6 COMMUNICATION INTERFACE PROTOCOL
7.6.1 Data
format
Serial data format is 8 bit, one start bit and one stop bit. No party bit.
7.6.2 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 7.8.3 for details.
7.6.3 End of Message
The end of message is the Carriage Return character (ASCII 13). The power supply ignores the Line
Feed (ASCII 10) character.
7.6.4 Command
Repeat
The backslash character “\” will cause the last command to be repeated.
7.6.5 Checksum
The user may add a checksum (optional) to the end of the command. The checksum is “$” followed by
two hex characters. If a command or a query has a checksum, the response will also have one. There is
no CR between the command string and the “$” sign.
Example: STT?3A
STAT?$7B
7.6.6 Acknowledge
The power supply acknowledges received commands by returning an “OK” message. If an error is de-
tected the power supply will return an error message. The rules of checksum also apply to the acknowl-
edge.
IN
OUT
POWER SUPPLY
#1
IN
OUT
POWER SUPPLY
#2
IN
OUT
POWER SUPPLY
#3
IN
OUT
POWER SUPPLY
#31
RS232/RS485
RS485
RS485
RS485
Fig7-5: Multiple power supply RS232/485 connection
8
1
1
8
1
6
3
5
4
1
6
3
5
4
PIN NO.
HOUSING
HOUSING
PIN NO.
NAME
NAME
SHIELD
SG
TXD
TXD
RXD
RXD
SHIELD
SG
RXD
RXD
TXD
TXD
-
+
+
+
+
-
-
-
Serial link cable with RJ-45 shielded connectors (P/N: GEN/RJ-45)
Fig.7-6:
L=0.5m typ.
