User manual

Table Of Contents

6.5 StecaLink slave connection

NOTICE!

– The StecaLink slave connection is an RS-485 communication interface using a proprietary

bus protocol.

–

The StecaLink slave connection allows connection of superordinate communication levels

and control devices. The superordinate communication partner functions as the master

and controls the device via the StecaLink slave interface.

– The StecaLink slave interface can be used for e.g. updating the firmware via a Windows PC

with an RS-485-/USB-adapter and Steca Grid Bootloader software.

– A standard RJ45 network cable (CAT-5 Patch cable, 1:1) is used for connecting StecaLink

communication bus members.

– The last unused StecaLink slave connection in a communication chain must be terminated.

A termination plug for the StecaLink communication bus is supplied with the MPPT 6000-

– A StecaLink slave device may only be connected to

one StecaLink master. Multiple

StecaLink slave devices are connected to form a communication chain. Only one StecaLink

slave device is connected to the StecaLink master device.

–

Up to 22 MPPT 6000-S devices can be chain connected via their StecaLink slave sockets to

the StecaLink master socket of the MPPT 6000-M.

– The StecaLink slave bus is galvanically separated from the power unit of the MPPT 6000-M.

– The MPPT 6000-M provides a supply voltage at the StecaLink slave and StecaLink master

connections for slave devices that do not have their own power supply. Connecting a slave

to the StecaLink master loops the supply voltage through the slave members.

– Each slave must have its own unique address within a range of 1 to 99. No duplicate

addresses may be present. Set the address of the slave according to the slave manual.

– The maximum length of the entire bus cabling should not exceed 25 m.

– The MPPT 6000-M:

– has 2 StecaLink slave bus connections,

– is a slave at the StecaLink slave connection,

– has a StecaLink master connection,

– is always the master at the StecaLink master connection.

– The MPPT 6000-S:

– has 2 StecaLink slave connections,

– is always a slave at the StecaLink slave connection.

Set a unique slave address at the device with the StecaLink slave connection; see

Chapter

8.8.1 ‘StecaLink slave address setting’ on page 86.

2. Connect the StecaLink slave connection to the ‘StecaLink master’ connection of the

superordinate master device.

3. Use a free ‘StecaLink slave’ connection for looping the connection through further slaves.

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