Multi Drop Connection; Selecting A Single Power Supply In A Multi Drop Chain - TDK-Lambda G+1U 5kW User Manual

7.4

Multi Drop Connection

One IEEE Interface can control more than one
can be connected via RS485 interface to a power supply with the installed IEEE option. Refer to
Figure 7–2.The power supply connected to a PC via the GPIB cable must be configured to an IEEE
communication interface, the other must be configured to RS485 interface. Each unit must have a
unique address, ranging from 0 to 31. IEEE module automatically receives the address of the unit
into which it is installed. For RS485 interface, set Baud rate to "115200" bps and Communication
Language to "SCPI".
7.4.1

Selecting a Single Power Supply in a Multi Drop Chain

All of the SCPI commands may be sent to any one of the Power Supplies in RS485 chain by
sending the INSTrument:NSELect <NR1> command. All commands and queries will then apply
only to the selected power supply, until a new INSTrument:NSELect <NR1> command is sent.
At Power-up, the IEEE master power supply is automatically selected.
After sending INSTrument:NSELect <NR1> command, it is recommended to verify the command
by sending INSTrument:NSELect?, to make sure the following commands are not sent to the
wrong power supply.
Address 31 should be avoided on the GPIB connected power supply. Address 31 is used for
special command messages. RS485 power supplies can be set to any address, excluding the
address set on the GPIB connected power supply.
Figure 7–1: Point to Point Connection
NOTE
G
G
177
power supply. A maximum of 31 units
G
G
Figure 7–2: Multi Drop Connection