• Introduction
• Dimension
• Schematic
• Layout
• How to use
  • Commands
  • Settings
    • Communication parameter
    • Modem line signal
    • Counter values
    • Inter frame gap
    • Inter frame delimiter
    • Serial Transmission delay
    • Sending break signal
  • Getting status
    • Communication Parameter
    • Modem line signal
    • Counter values
    • Inter frame gap
    • Inter frame delimiter
    • Transmission delay
    • Received data size
    • Size of receive buffer
    • Free space in send buffer
    • Size of send buffer
  • Receiving data
  • Sending data

Size of Send Buffer

The command to get the size of send buffer is txbuf.

"get txbuf"

The response value is a string in integer form.

• an example of getting the size of send buffer

<?php
include "/lib/sd_spc.php";

$rwbuf = "";
$sid = 14;
spc_reset();
spc_sync_baud(115200);

spc_request_dev($sid, "set uart 115200N81");

$txbuf_len = (int)spc_request_dev($sid, "get txbuf");
echo $txbuf_len;    // output(e.g.): 12288
?>