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Template:Networking rutos manual serial utilities (view source)

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This manual page provides an overview of the Serial Utilities page in {{{name}}} devices.
 
This manual page provides an overview of the Serial Utilities page in {{{name}}} devices.
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{{#ifeq: {{{rs232}}} | 1 |
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==General information==
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===RS232===
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----
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====Connector pinout====
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----
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The RS232 connector type on this device is a '''DCE female'''. DCE stands for Data Communication Equipment.
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[[File:Services_rs232_connector.PNG|400px]]
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<table class="nd-othertables">
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    <tr>
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        <th style="width: 30px">PIN</th>
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      <th style="width: 60px">NAME*</th>
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      <th style="width: 170px">DESCRIPTION*</th>
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        <th style="width: 400px">DIRECTION ON THIS DEVICE</th>
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    </tr>
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    <tr>
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      <td>1</td>
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      <td>DCD</td>
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      <td>Data Carrier Detect</td>
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      <td>Output</td>
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    </tr>
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    <tr>
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      <td>2</td>
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      <td>RXD</td>
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      <td>Receive Data</td>
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      <td>Output</td>
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    </tr>
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    <tr>
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    <td>3</td>
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        <td>TXD</td>
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        <td>Transmit Data</td>
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      <td>Input</td>
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    </tr>
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    <tr>
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    <td>4</td>
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        <td>DTR</td>
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        <td>Data Terminal Ready</td>
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      <td>Input</td>
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    </tr>
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    <tr>
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      <td>5</td>
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      <td>GND</td>
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      <td>Signal Ground</td>
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      <td>-</td>
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    </tr>
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    <tr>
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      <td>6</td>
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      <td>DSR</td>
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      <td>Data Set Ready</td>
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      <td>Output</td>
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    </tr>
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    <tr>
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    <td>7</td>
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        <td>RTS</td>
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        <td>Ready To Send</td>
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      <td>Input</td>
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    </tr>
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    <tr>
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    <td>8</td>
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        <td>CTS</td>
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        <td>Clear To Send</td>
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      <td>Output</td>
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    </tr>{{#ifeq:{{{series}}}|TRB1|
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    <tr>
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    <td>9</td>
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        <td>RI</td>
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        <td>Ring Indicator</td>
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      <td>Output (connected to +3.8V permanently via a 4.7k resistor) </td>
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    </tr>|
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    <tr>
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    <td>9</td>
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        <td>RI</td>
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        <td>Ring Indicator</td>
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      <td>Output (connected to +5V permanently via a 4.7k resistor) </td>
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    </tr>}}
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</table>
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====Cables====
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----
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There are two types of RS232 serial devices: '''DTE''' and '''DCE'''. DTE typically refers to the serial port on a PC or terminal, while DCE refers to communication devices. Connectors mounted on DTE are likely to be male, and those mounted on DCE are likely to be female.
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This device is DCE and has a female connector.
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----
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To connect a standard DTE device, use a straight-through Female/Male RS232 cable:
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[[File:Services rs232 connector female male.PNG]]
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See straight cable pinout below:
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[[File:Straight cable pinout v2.png|400px]]
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 +
----
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To connect another DCE device to RUT955, a Null-modem (crossed) Male/Male cable should be used:
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[[File:Male male rs232 cable.jpg]]
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See straight crossed cable pinout below:
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[[File:Straight crossed rs232 cable pinout v2.png|400px]]
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 +
----
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Maximum cable length is 15 meters or the cable length equal to a capacitance of 2500 pF (for a 19200 baud rate). Using lower capacitance cables can increase the distance. Reducing communication speed can also increase maximum cable length.|}}
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{{#ifeq: {{{rs485}}} | 1 |
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===RS485===
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----
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====Connector pinout====
 +
----
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Below is a depiction of the RS485 connector pins:
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 +
<table class="wikitable" style="border: 1px solid black; background: white;">
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    <tr>
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        <th style="border: 1px solid black; width: 250px" colspan="3"><span style=color:#104996><b>RS485 connector pinout</b></span></th>
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        <th style="border: 1px solid white; border-left: 1px solid black; background: white;" rowspan="7">[[File:Trb145_rs485_pinout_v1.png|130px|right|bottom]]</th>
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    </tr>
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    <tr>
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        <td style="border: 1px solid black;">Pin</td>
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        <td style="border: 1px solid black;">Name</td>
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        <td style="border: 1px solid black;">Description</td>
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    </tr>
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    <tr>
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        <td style="border: 1px solid black;">1</td>
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        <td style="border: 1px solid black;">D_N</td>
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        <td style="border: 1px solid black;">Driver negative signal</td>
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    </tr>
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    <tr>
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        <td style="border: 1px solid black;">2</td>
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        <td style="border: 1px solid black;">R_N</td>
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        <td style="border: 1px solid black;">Receiver negative signal</td>
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    </tr>
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    <tr>
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        <td style="border: 1px solid black;">3</td>
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        <td style="border: 1px solid black;">GND</td>
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        <td style="border: 1px solid black;">Device ground</td>
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    </tr>
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    <tr>
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        <td style="border: 1px solid black;">4</td>
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        <td style="border: 1px solid black;">D_P</td>
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        <td style="border: 1px solid black;">Driver positive signal</td>
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    </tr>
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    <tr>
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        <td style="border: 1px solid black;">5</td>
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        <td style="border: 1px solid black;">R_P</td>
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        <td style="border: 1px solid black;">Receiver positive signal</td>
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    </tr>
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    <tr>
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        <td style="border: 1px solid black;">6</td>
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        <td style="border: 1px solid black;">Vin</td>
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        <td style="border: 1px solid black;">Power input 9-30 VDC</td>
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        <td style="border: 1px solid white; border-left: 1px solid black; width: 250px" colspan="1"><span style=color:white>filler text</span></td>
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    </tr>
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</table>
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====Cable type====
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----
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Recommended cable parameters:
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<table class="nd-othertables">
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    <tr>
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        <th style="width: 300px">PARAMETER</th>
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      <th style="width: 850px">VALUE</th>
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    </tr>
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    <tr>
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      <td>Cable Type</td>
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      <td>22-24 AWG, 2 – pair (used for full-duplex networks ) or 1-pair (used for half duplex networks). One addtitional wire for ground connection is needed</td>
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    </tr>
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    <tr>
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      <td>Characteristic cable Impedance</td>
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      <td>120 Ω @ 1MHz</td>
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    </tr>
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    <tr>
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    <td>Capacitance (conductor to conductor)</td>
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        <td>36 pF/m</td>
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    </tr>
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    <tr>
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    <td>Propagation Velocity</td>
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        <td>78% (1.3 ns/ft)</td>
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    </tr>
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</table>}}
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====Maximum data rate vs. transmission line length====
 +
----
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The RS485 standard can be used for network lengths up to 1200 meters, but the maximum usable data rate decreases as the transmission length increases. A device operating at the maximum data transfer rate (10 Mbps) is limited to a transmission length of about 12 meters, while a distance up to 1200 meters can be achieved at 100 Kbps. A rough relation between maximum transmission length and data rate can be calculated using this approximation:
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[[File:Services rs485 formula.PNG]]
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Where:
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<ul>
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    <li><b>L<sub>max</sub></b> - maximum cable length in meters.</li>
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    <li><b>DR</b> - maximum data rate in bits per second.</li>
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</ul>
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 +
Twisted pair is the preferred cable type for RS485 networks. Twisted pair cables pick up noise and other electromagnetically induced voltages as common mode signals, which are rejected by the differential receivers.
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====2-Wire and 4-Wire Networks====
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----
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Below is an example of a 4-wire network electrical connection. There are 3 devices shown in the example. One of the devices is the "master" and other two are "slaves". Termination resistors (120 Ω each) are placed at each cable end. Four-wire networks consists of one master with its transmitter connected to each of the slaves' receivers on one twisted pair. The slave transmitters are all connected to the master receiver on a second twisted pair:
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 +
[[File:Services rs485 4wire.PNG]]
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Example 2-wire network electrical connection: to enable a 2-wire RS485 configuration you need to connect D_P to R_P and D_N to R_N on the device’s RS485 socket. Termination resistors are placed at each cable end (120 Ω each):
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 +
[[File:Services rs485 2wire.PNG]]
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|}}
    
==Modem Control==  
 
==Modem Control==  
Retrieved from "https://wiki.teltonika-networks.com/view/Special:MobileDiff/99116"

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