EXTECH printers can be equipped with an optional Bluetooth communication module. To activate communication via BT, please familiarize yourself with the settings of PIN - DIP SWITCH (located under the battery) of a given model [see here]. 

In the moment when the computer with which you wish the printer to communicate requests a code to secure the transmission of data, please enter a zero (PIN = 0)
 

BT module parameters for printer S4000T/S4500T
(these data are also available in the instructions for developers located on our Web page in the instructions section for each printer model)

♦ Name: EXTECH Printer
♦ Serial Settings: 115200,8,n,2
♦ Discoverability mode: Generally Discoverable
♦ Connectability mode: GAP Connectable
♦ Security mode: Security Disabled
♦ Fixed PIN = 0
♦ Set Master/Slave Policy: Always let the connecting device select master/slave role on incoming connections
♦ Client Profile: Disable Client Services
♦ Server Profile: Serial Port Profile Server enabled
♦ Wireless Multi-drop mode: disabled, forward to host only
♦ Set Serial Interface: (RS232)
♦ Configuration over Bluetooth – Enabled
♦ Power Save mode: Allow Sleep mode only
♦ ESC sequence timing: 500ms before ESC command & 500ms after

It is possible to adjust some of the above elements with the help of special AT commands sent to the printer (name, pin, etc.). To learn more, please contact us at bmajdanski@adtech.pl.