85
NOTE:
If a custom cable is used, connect only the pins listed in the table above. Keep pins 1, 2 and 7 not
connected.
CAUTION
When using multiple LAN controllers with Multi-drop, only one Power Supply may be “selected” at
a time because one controller may change the selected address and the others may not be aware
that a new address is active.
E. Set the Master Power Supply (First unit)
1. Set the Master Power Supply communication interface (RS232, RS485, USB, LAN or Optional
communication i.e. IEEE). Refer to section 5.2.2.
2. Set the supply’s RS-485 address as described below. Refer to section 5.2.3.
F. Set the Slave Power Supply (RS-485 units)
1. Set the Slave Power Supply communication interface to RS485. Refer to section 5.2.2.
2. Set the supply’s RS-485 address as described below. Refer to section 5.2.3.
G. Selecting One Power Supply in a Multi-drop Chain
All the SCPI commands may be sent to any one of the supplies in an RS-485 chain by first sending
the INSTrument:[N]SELect <NR1> address command.
All commands and queries will then apply only to the selected supply, until a new
INSTrument:[N]SELect <NR1> is sent.
After sending INSTrument:[N]SELect <NR1>, it is recommended to verify the command by sending
INSTrument:[N]SELect?, otherwise further commands may go to the wrong Power Supply.
H. Global Commands in a Multi-drop Chain
•
The GLOBAL commands affect all of the supplies at the same time (Master and Slaves).
•
There is no SYSTEM:ERROR? response message if one or more supplies cannot execute a
global command.
•
There is no query version of these commands. Global settings must be queried by selecting
one Power Supply at a time and reading its setting.
•
The global commands do not affect which Power Supply has been selected using the
INSTrument:[N]SELect <NR1> command. For example, if the following commands are sent:
INST:NSEL 4
VOLT 50
GLOB:VOLT 70
VOLT 90
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