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--- uphp:functions:f485open [2017/03/27 16:07]
jeff
+++ uphp:functions:f485open [2021/09/13 05:57]
@@ Line 1: / Line 1: @@
-======f485open======
-<badge>WMPRO, WMMINI FW >= 1.922</badge> <badge>WMMEGA FW >= 2.0</badge>
-Open the RS-485 port at the specified baud rate and parity
-====Description====
-<well size="sm"><html><span style="font-size:125%;color:green;">int
-<span style="color:black;"></html>[[f485open]]
-<html>(
-<span style="color:green;">int
-<span style="color:blue;">$baud<span style="color:black;">,
-<span style="color:green;">int
-<span style="color:blue;">$parity
-<span style="color:black;">)
-</html></well>
-Attempt to open the RS-485 port as a stream, and return the file handle for future operations
-In order to use the RS-485 port, you need to disable modbus polling (see [[how_tos:Serial Port Programming#Using the RS-485 Serial Port]]).
-====Parameters====
-<html><span style="color:blue;"><b>baud</b><span style="color:black;"></html>:  Rate in bits per second
-<html><span style="color:blue;"><b>parity</b><span style="color:black;"></html>:  0 (even parity) or 1 (odd parity)
-====Return Value====
-Upon success it returns a file handle which may be used together with the other file functions that require a handle such as [[fgets()]], [[fwrite()]], [[fclose()]] and [[feof()]]
-If the attempt to open the RS-485 port fails it will return 0
-====Example====
-**Open the 485 port at 115200 baud with even parity:**
-<code php>
-<?
-  $fp=f485open(115200,0);
-  if (!$fp) {
-    print("Serial open failed");
-  } else {
-    $res=fwrite($fp,"Hello from wattmon");
-    if ($res) {
-      print("An error occurred while trying to write to the port");
-    }
-    fclose($fp);
-  }
-?>
-</code>
-====See Also====
-[[how_tos:Serial Port Programming]] - Some information on connecting and using the serial ports
-[[fseropen()]] - Open the serial port at the specified baud rate with optional parameters
-[[fsockopen()]] - Open an internet socket connection with optional timeout
-[[fopen()]] - Open a file for reading or writing
-[[fclose()]] - Close a file, stream or socket
-[[feof()]] - Test if no more data is available in a file or stream
-[[fgets()]] - Return a single line from a file or stream, with optional size limit
-[[fread()]] - Return bytes from a file or stream
-[[fwrite()]] - Write data to a file or stream

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