TDK-Lambda Genesys Series, Technical Manual

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9. RS-485 MULTI-DROP CHAIN
9.1. Introduction
The Genesys™ power supply LAN option allows you to control up to 29 other supplies which
do
not have the LAN option installed. All are controlled through one IP address from the supply
with the LAN option
This is called the Multi-drop configuration. The Ethernet cable goes to the LAN supply. All the
other supplies are connected using a RS-485 Serial Link Cable between the J3-OUT to J3-IN
sockets. The multi-drop feature adds the ability to operate all the linked power supplies with one
global command
NOTE: The RS-485 power supplies must be Multi-drop enabled
See section 9.3.1 below
Network
Server
Ethernet
Hub
CAT-5
Cables
RS-485
Link Cable
IP Addresses
must be different
RS-485 Addresses
must be different
RS-485 Addresses
may be the same
RS-485
Link Cable
LAN Option
MD Option
LAN Option
MD Option MD Option
MD Option
Up to 30 supplies
in one chain
Up to 30 supplies
in one chain
LAN
J3-OUT J3-OUT J3-IN J3-OUT J3-IN
Optional RS-485
terminators
J3-OUT J3-IN J3-OUT J3-IN
J3-OUT
LAN
Figure 7. Configuring a Multi-drop System of Supplies
9.2. Con fi gure the LAN Supply
The LAN power supply, at the head of the multi-drop chain, is sometimes called the Master
supply.
9.2.1. To Set Up the Master Power Supply:
A. Connect the LAN to a computer as described in section 0
B. Enable the LAN option with it’s rear panel switch. See Figure 3
C. Set the supply into RS-232 mode by setting rear-panel SW1 bit 6 to DOWN
D. Connect a RS-485 Link cable from the rear J3-OUT jack to the next supply’s J3-IN
E. Power-up the supply
F. Set the supply’s RS-485 address as described below