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2-5. Multidrop Interface
2-5-1. Multiple Unit Connection
The PFR-100 power supplies can have up to 31 units daisy-chained together
using the 8 pin connectors (Remote-IN OUT ports) on the rear panel. The first
unit (master) in the chain is remotely connected to a PC using USB, GPIB or
LAN (Multi-Drop mode). Each subsequent unit (slave) is daisy-chained to the
next using a RS485 local bus. The Remote-OUT port on the last terminal must
be terminated by the end terminal connector.
USB/LAN/GP-IB
RS-485
MAX 31 Set
RS-485
Termi
nator
There is a mode for controlling multiple units. This 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. Each unit is
assigned a unique address and can then be individually controlled from the host
PC.
2-5-1-1. Multi-Drop mode
Operation
1. All units must be powered down before starting the
Multi-Drop mode configuration.
2. Connect the first unit
’s LAN, USB or GPIB port to a PC.
3. Connect the Remote-OUT port on the first unit to the IN
port of the second unit using the master serial link cable
(gray plug)GTL-261.
4. Connect all the remaining units between the Remote-OUT
port and the IN port with the slave serial link cable (black
plug) GTL-262 until all the desired units have been
daisy-chained together.
5. Terminate the Remote-OUT port of the last unit with the
end terminal connector included in the GTL-261.
