Below is a snipit of code which you can use to get the data from the meter... of course your PHP must have the extensions for snmp and tcp -- which i think come standard.
Code: Select all
<?php
function get_meter_data($meter_number, $remote_address, $remote_port) {
//$meter_number is the meters serial number. leading 0s not required.
//$remote_address is the IP address of the ethernet-RS485 converter
//$remote_port is the TCP port number the converter is listening to (50000 in my case)
//We do not check the checksum - I'm lazy. Probably should. Running for 8 months, querying
//once per minute..I've encountered one or two bad results from the meter.
/* Connect and get response */
// fix up the meter number with the correct amount of leading zeros
$meter_number = str_pad($meter_number, 12, "0", STR_PAD_LEFT);
//create a new socket and make sure it worked
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket === false)
echo "socket_create() failed: reason: ".socket_strerror(socket_last_error())."\n";
// connect to the meter and check to make sure we connected
$res = socket_connect($socket, $remote_address, $remote_port);
if ($res === false)
{
echo "socket_connect() failed.\nReason: ($result) " . socket_strerror(socket_last_error($socket)) . "\n";
echo "Aborting";
exit;
}
//send query string to the meter. e.g. /?000000000123! then a CRLF
socket_write($socket, "/?" . $meter_number . "!\r\n");
//Receive a response of 255 bytes. Wait till we have all of them!
$res = socket_recv($socket, $response, 255, MSG_WAITALL);
if ($res === false)
echo "socket_recv() failed; reason: " . socket_strerror(socket_last_error($socket)) . "\n";
// no idea what this is about. EKM Meter software sends it, so we will too. Then close the connection.
$message = "\x0a\x03\x32\x3d";
socket_write($socket, $message);
socket_close($socket);
// Now the fun stuff. parsing through the 255 byte response
$meter_number = substr($response,4,12);
$meter_model = substr($response,1,2); //non-ASCII
$meter_firmware = substr($response,3,1); //non-ASCII
$KWh_total = substr($response, 16, 8) / 10;
$L1_KWh = substr($response, 24, 8) / 10;
$L2_KWh = substr($response, 32, 8) / 10;
$L3_KWh = substr($response, 40, 8) / 10;
$L4_KWh = substr($response, 48, 8) / 10;
$ReverseKWh_total = substr($response, 56, 8) / 10;
$L1_ReverseKWh = substr($response, 64, 8) / 10;
$L2_ReverseKWh = substr($response, 72, 8) / 10;
$L3_ReverseKWh = substr($response, 80, 8) / 10;
$L4_ReverseKWh = substr($response, 88, 8) / 10;
$L1_volt = substr($response,96, 4) / 10 ;
$L2_volt = substr($response,100, 4) / 10;
$L3_volt = substr($response,104, 4) / 10 ;
$L1_amp = substr($response,108, 5) / 10;
$L2_amp = substr($response,113, 5) / 10;
$L3_amp = substr($response,118, 5) / 10;
$L1_watt = substr($response,123, 7) / 1;
$L2_watt = substr($response,130, 7) / 1;
$L3_watt = substr($response,137, 7) / 1;
$watt_total = substr($response,144, 7) / 1;
$L1_pf = substr($response,151, 4);
$L2_pf = substr($response,155, 4);
$L3_pf = substr($response,159, 4);
$max_demand = substr($response, 163,7) / 1;
$demand_period = substr($response, 170,1); //not sure of units
$meter_date = "20" . substr($response, 172,2) . "-" . substr($response, 174,2) . "-" . substr($response, 176,2) . " " . substr($response, 180,2) . ":" . substr($response, 182,2) .":" . substr($response, 184,2);
$CT_rating = substr($response, 86,4);
$pulse1_count = substr($response, 163,8) / 1;
$pulse2_count = substr($response, 171,8) / 1;
$pulse3_count = substr($response, 179,8) / 1;
$pulse1_ratio = substr($response, 187,4) / 1;
$pulse2_ratio = substr($response, 191,4) / 1;
$pulse3_ratio = substr($response, 195,4) / 1;
$pulse_HL = substr($response, 202,3) ;
// do whatever you want with the data.
print "Meter Number: " . $meter_number . "\r\n";
print "KWh Total: " . $KWh_total. "\r\n";
print "Reverse KWh Total: " . $ReverseKWh_total. "\r\n";
print "L1 V: " .$L1_volt. "\r\n";
print "L2 V: " . $L2_volt. "\r\n";
print "L3 V: " . $L3_volt. "\r\n";
print "L1 A: " . $L1_amp. "\r\n";
print "L2 A: " . $L2_amp. "\r\n";
print "L3 A: " . $L3_amp. "\r\n";
print "L1 W: " . $L1_watt. "\r\n";
print "L2 W: " . $L2_watt. "\r\n";
print "L3 W: " . $L3_watt. "\r\n";
print "Watt Total: " . $watt_total. "\r\n";
print "L1 Pf: " . $L1_pf. "\r\n";
print "L2 Pf: " . $L2_pf. "\r\n";
print "L3 Pf: " . $L3_pf. "\r\n";
print "Max Demand: " . $max_demand. "\r\n";
print "Meter Date: " . $meter_date. "\r\n";
} //end of function
/* MAIN */
get_meter_data(11123,"10.5.2.17",50000);
?>
Thank you so much for sharing! We love this type of collaboration.