T3PS Series Programming Manual
34
Multiple Unit Connection
The T3PS 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 on the
last terminal must be terminated by the end terminal connector.
There are two modes for controlling multiple units. The first mode
only allows the user to enter legacy commands (Legacy Multi-Drop
mode). All UART parameters have to be configured in this mode.
The second mode allows the user to enter the SCPI commands
developed for the instrument (Multi-Drop mode). In this mode,
only the Multi-Drop parameters have to be specified. For both
modes, each unit is assigned a unique address and can then be
individually controlled from the host PC.
Legacy Multi-Drop mode
Operation
1.
Check the F-89 (System version and build date)
settings first on all units. 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.
3.
Connect the OUT port on the first unit to the IN
port of the second unit using slave serial link
cable.
4.
Connect all the remaining units in the same
fashion until all the units have been daisy-
