PSU Series User Manual
170
Multiple Unit Connection
The PSU power supplies can have up to 31 units daisy chained
together using the 8 pin connectors (IN OUT ports) on the rear
panel. The first unit (master) in the chain is remotely connected to a
PC using RS232 or RS485 (Legacy Multi-Drop mode), or USB, GPIB
or LAN (Multi-Drop mode). Each subsequent unit (slave) is daisy
chained to the next using a RS485 local bus. The OUT port of the
first unit must be connected to intermediate connector and the OUT
port of the last unit must be connected to end terminal connector.
There are two modes for controlling multiple units. In the first
mode (Legacy Multi-Drop mode), the PC is only allowed to use
RS232 or RS485 to connect to the first device, and all UART
parameters must be executed in this mode Configuration. The
remote command supports the SCPI commands or TDK GENESYS
legacy commands.
In the second mode (Multi-Drop mode), the PC is allowed to
connect to the first unit using USB-CDC/GPIB/LAN. In this mode,
you only need to specify the Multi-Drop parameter. Remote
commands only support SCPI commands.
For these two modes, each unit is assigned a unique address, which
can then be controlled independently of the host PC.
Legacy Multi-Drop mode
1. Check the F-89 (System version and build date)
settings first on all units (see page 108). The
two parameters O and P (Option Module)
must be the same on all units before any
multiple unit connection can be established.
Example: F-89 O:00, P:01.
2. Connect the first unit’s IN port to a PC via
RS232 or RS485 serial cable.
Use the serial cables supplied in the PSU-
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