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--- en:sw:01-mervis:connecting-to-unipi-extension-hidden [2020/06/16 07:33]
avsetula
+++ en:sw:01-mervis:connecting-to-unipi-extension-hidden [2021/04/29 13:47]
avsetula [Connecting to Unipi extension]
@@ Line 3: / Line 3: @@
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 The Unipi extensions are a convenient way how to extend the number of inputs and outputs at one location or make accessible at another one.
+The communication between controller and extension is via RS485 ports. The extension acts as a Modbus slave, which has extended support in the Mervis.
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 ;;#
+<html><span class="dev-tag dev-patron">Patron</span></html> \\
+<html><span class="dev-tag dev-neuron">Neuron</span></html> \\
+<html><span class="dev-tag dev-gate">Gate</span></html> \\
 <html><span class="dev-tag dev-axon">Axon</span></html> \\
-<html><span class="dev-tag dev-neuron">Neuron</span></html> \\
 <html><span class="dev-tag dev-extens">Extension</span></html>
 ;;#
 </WRAP>
 </WRAP>
-The communication between controller and extension is via RS485 ports. The extension acts as a Modbus slave, which has extended support in the Mervis.
 ===== HW connection =====
@@ Line 20: / Line 22: @@
 {{:cs:sw:01-mervis:connecting-the-unipi-extension-01-hw-connection.png|}}
-For communication to work, you have to have identical serial port parameters on both sides - speed, data bits, stop bits and parity.  Also, each extension unit has to have unique Modbus address. You can set those in two ways: by HW DIP switches or in the Mervis.
+===== Module addressing and communication parameters =====
+{{page>en:hw:04-extensions-communication-hidden}}
-==== DIP switches ====
-DIP switches are small levers with two positions - up or down. If the lever is pushed down, its specific function is enabled.
-{{:cs:sw:01-mervis:dipswitch.png|}}
-On all Extension models, the DIP switches allow for configuring bitrate, parity and address.
-<html><span class="kbBlueText">The RS485-END</span></html>, placed next to RS-485 connectors, is intended for attaching or unattaching an internal 120Ω resistor between RS485-A and RS485-B ports for a proper termination of the RS-485 bus. The resistor needs to be attached if the said module is the last device on the bus - this instruction applies mostly for large serial buses several hundred meters long.
-<html><span class="kbBlueText">Switches 1 to 3</span></html> serve for device addressing in a binary format, and can be used to set an address within 0-7 range.
-^ Address ^ DIP no.1 ^ DIP no. 2 ^ DIP no. 3 ^
-| 0       | OFF       | OFF       | OFF       |
-| 1       | ON        | OFF       | OFF       |
-| 2       | OFF       | ON        | OFF       |
-| 3       | ON        | ON        | OFF       |
-| 4       | OFF       | OFF       | ON        |
-| 5       | ON        | OFF       | ON        |
-| 6       | OFF       | ON        | ON        |
-| 7       | ON        | ON        | ON        |
-<html><span class="kbBlueText">DIP switch 4</span></html> configures the serial bus' bitrate. There are two bitrates available - **19200 bps** (''OFF'' position) and **9600 bps** (''ON'' position.
-<html><span class="kbBlueText">DIP switch 5</span></html> serves for switching between **even** parity (''OFF'' position) or **no** parity (''ON'' position).
-==== Software settings ====
-The connection parameters can be also set in Mervis. The HW settings take precedence, so to SW settings take place **you have to set the address to 0**. The rest will be described [[#reconfiguration_of_the_unipi_extension|later]] in this tutorial.
 ===== Using Unipi extension in the Mervis =====