User manual

PSU Programming Manual
42
Multiple Unit Connection Using Local RS485 Bus
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 in the chain is remotely connected to a PC
using RS232 or RS485. Each subsequent unit is daisy-chained to the
next using an RS485 local bus. The OUT port on the last terminal
must be terminated by the end terminal connector.
Only the TDK GENESYS legacy commands can be used when
using multiple units over the local RS485 bus, SCPI commands
cannot be used. When using the TDK commands, each unit is
assigned a unique address and can then be individually controlled
from the host PC. When using SCPI commands via RS232/RS485,
remote commands can only be used to control the master unit.
Operation
1. Connect the first unit’s IN port to a PC via
RS232 or RS485.
 Use the serial cables supplied in the PSU-
232 or PSU-485 connection kit.
2. Connect the OUT port on the first unit to the IN
port of the second unit using the serial link
cable supplied in the PSU-232 or PSU-485
connection kit.
3. Connect all the remaining units in the same
fashion until all the units have been daisy-
chained together.
RS 485 / 232
OUT IN
Unit #1
RS 485 / 232
OUT IN
Unit #2
RS 485 / 232
OUT IN
Unit #N
End terminal
connector
To PC
RS232/RS485
serial cable
Serial link
cable
Serial link
cable