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--- uphp:serial_port_programming [2017/02/12 11:45]
jeff created
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-====== Serial Port Programming ======
-WattmonPRO comes with an RS-232 serial interface on pins 7 and 8 and an RS-485 port on an RJ45 connector.  The device is configured by default for RS-232 voltage levels and using a simple DB9 cable can be connected to any serial device.  For specific devices that require TTL levels, a jumper setting inside the device can bypass the level converter IC and it can thus be used to interface with sensors or other devices at 3.3V DC.
-===== Using the RS-232 Serial Port =====
-To open the serial port, use the [[fseropen|fseropen()]] function.
-The serial port is treated like a file after opening and standard file functions such as [[fread|fread()]], [[fwrite|fwrite()]], [[fgets|fgets()]] and [[filesize|filesize()]] apply.
-An example of using the serial port is shown below:
-<code php><?
-  // Open the serial port at 115200 baud in non-blocking mode
-  $fp = fseropen(115200,0);
-  if (!$fp) {
-     print("Serial open failed\n");
-  } else {
-    $res = fwrite($fp,"Hello from wattmon");
-    if ($res) {
-       print("An error occured while trying to write to the port");
-    }
-    fclose($fp);
-  }
-?></code>
-==== Jumper Settings inside Wattmon ====
-{{:wiki:rs232_mode.png?250|}} < //Settings For RS-232 Mode   //{{:wiki:ttl_mode.png?250|}} < //Settings for TTL Mode//
-==== RS-232 Cable Connection ====
-In order to connect to a device you will need to procure a DB9 cable (male or female) and connect it up as shown in the following diagram.
-{{:wiki:wattmonpro_rs232.png?300|}}
-===== Using the RS-485 Serial Port =====
-In order to use the RS-485 port, you need to disable modbus polling.  This is done from the Devices > Options > Edit Communication Settings as shown here:
-{{:wiki:modbus_polling_setting.png?600|}}
-To open the RS-485 port, use the [[f485open|f485open()]] function.
-The RS-485 serial port is treated like a file after opening and standard file functions such as [[fread|fread()]], [[fwrite|fwrite()]], [[fgets|fgets()]] and [[filesize|filesize()]] apply.
-An example of using the RS-485 serial port is shown below:
-<code php><?
-  // Open the 485 port at 115200 baud with no parity
-  $fp = f485open(115200,0);
-  if (!$fp) {
-     print("Serial open failed\n");
-  } else {
-    $res = fwrite($fp,"Hello from wattmon");
-    if ($res) {
-       print("An error occured while trying to write to the port");
-    }
-    fclose($fp);
-  }
-?></code>
-==== RS-485 Cable Connection ====
-Use a standard RJ-45 cable and cut it to connect your RS-485 device to WattmonPRO.
-^ PIN      ^ Color      ^ Description    ^
-| 1,2      | Orange     | GND            |
-| 4        | Blue       | D+ / A         |
-| 5        | White-Blue | D- / B         |
-{{:wiki:rj45_connector_pinout.png|}}

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