====== First steps ======

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<span class="tag-extens">Extension</span>
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Unipi Extension are input and output extension modules for Unipi units, but also all third party controllers with **RS-485 interface and Modbus RTU** protocol.

In the **default configuration** of the device, the analog inputs and outputs are set in voltage mode and all outputs are deactivated. All DIP switches are disabled (OFF position), so that [[.:technical-parameters#rs-485_interface|terminating resistor]] is not connected and [[.:communication-and-addressing-of-module|SW configuration]] communication parameters are applied. The communication uses the Modbus RTU protocol, the table of coils and registers is available in the [[.:downloads|]] section. 

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**Attention**: \\
Always follow the [[.:safety-instructions|]] when handling the device. 
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===== Mounting =====

All units of the Unipi Extensions product line are structurally designed for mounting on a TH 35 mm DIN rail according to EN 60715.

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===== Connection =====

Disconnectable screw terminals are used to connect the wires to the device. The purpose of each terminal contact is described on the top side of the unit case. Use the appropriate flathead screwdriver to install the wires into the terminals. Do not exceed the maximum tightening torque specified in [[.:technical-parameters#storage_installation_and_operating_conditions|technical parameters]].

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**Attention**: \\
Always connect all cable shields (RS-485, analog sensors, etc.) on one side of the cable only, directly to the ground terminal of the cabinet/box, never to the ground point of the device. 
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**Warning**: \\
Take extra care when plugging in, there is a risk of electric shock! Always ensure and check that the environment and device are disconnected from all voltage sources before starting work.
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==== RS-485 connection ====

RS-485 communication line (EIA-485) is connected to the RS485 terminal contacts marked A and B. The device has an optional 120 Ω terminating resistor (terminator), marked RS485-END.

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**Please note**: \\
We recommend that you comply with the following instructions for reliable bus operation:
  * Ensure the shortest possible wiring length between devices
  * Ensure the serial topology of the bus
  * Use shielded cabling, preferably 0.8 mm diameter J-Y(ST)Y and twisted pairs, or FTP CAT6
  * Set the optimal communication speed in relation to the interference from the surrounding environment
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**Configuration**: \\
The default settings are always read when the device is (re) started. If the address selected by the DIP switches is greater than 0, the [[.:communication-and-addressing-of-module#hw_configuration_using_dip_switches|HW configuration]] of the communication parameters will be applied.
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==== Power supply connection ====

To ensure correct operation of the device, it is necessary to first connect the 24V power supply wires to the contacts as described on the device, +24V/positive contact and GND/negative contact of the detachable screw terminal block. For information on recommended supply voltage tolerance and power consumption, refer to [[.:technical-parameters#power_supply|operating conditions]] and the product label.

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//Power supply connection//
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**Warning**: \\
The device has appliance class I. To protect against electric shock and to comply with electromagnetic compatibility (EMC), it is also necessary to connect protective ground conductor to ground connector of the device marked on the case with symbol {{:files:earth_ground.png?nolink&16|(⏚)}}. For ground conductor connection use ring tongue and provided M4 screw with serrated lock washer.

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DIN rail on which the device is installed must be connected to the main protective earth point of the cabinet/box as well.
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{{page>.:01-first-steps:operation-hidden}}