• Introduction
• Dimension
• Schematic
• Layout
• How to Use
  • Commands
  • Controlling Output
  • Getting Status of Output

Getting Status of Output

Calling spc_request_dev function for getting status of output ports

spc_request_dev($sid, $cmd);

• $sid : a slave ID
• $cmd : a command string

Structure of a command string is as follows:

"get $port output"

• $port : an index number of an output port, 4 numbers from 0 to 3 are available

Return Value

The normal return value is in string form and is as follows:

Example

<?php
include "/lib/sd_spc.php";
spc_reset();
spc_sync_baud();
$sid = 1;

echo "turn all output ports on\r\n";
spc_request_dev($sid, "set 0 output high");
spc_request_dev($sid, "set 1 output high");
spc_request_dev($sid, "set 2 output high");
spc_request_dev($sid, "set 3 output high");

// get status of output ports
echo "Port 0: ", spc_request_dev($sid, "get 0 output"), "\r\n";
echo "Port 1: ", spc_request_dev($sid, "get 1 output"), "\r\n";
echo "Port 2: ", spc_request_dev($sid, "get 2 output"), "\r\n";
echo "Port 3: ", spc_request_dev($sid, "get 3 output"), "\r\n";

sleep(1);

echo "turn all output ports off\r\n";
spc_request_dev($sid, "set 0 output low");
spc_request_dev($sid, "set 1 output low");
spc_request_dev($sid, "set 2 output low");
spc_request_dev($sid, "set 3 output low");

// get status of output ports
echo "Port 0: ", spc_request_dev($sid, "get 0 output"), "\r\n";
echo "Port 1: ", spc_request_dev($sid, "get 1 output"), "\r\n";
echo "Port 2: ", spc_request_dev($sid, "get 2 output"), "\r\n";
echo "Port 3: ", spc_request_dev($sid, "get 3 output"), "\r\n"
?>

Output

turn all output ports on
Port 0: 1
Port 1: 1
Port 2: 1
Port 3: 1
turn all output ports off
Port 0: 0
Port 1: 0
Port 2: 0
Port 3: 0