PROMI-SD205-OA allows the following functions without any software configuration:
Baud rate setting by Dip Switch (Promi-SD205 OA)

This  feature is only on Promi-SD205 OA. With the combination of 4 slot dip switches,  baud  rate  and  hardware flow control can be set simply without the host computer.

The Upper 3 dip switches are used for setting baud rate, and bottom dip switch is used for setting the hardware flow control option. If the baud rate needs to be set out of the range given below, PromiWIN or terminal program should be used for extended AT commands. At this time combination of dip switches must be complied with AT cmd. Then baud rate will go back to 9600 as a default.

Pairing Button (communication between two PROMI-SDs)

Promi-SD provides Pairing Button for instant configuration without a PC to make an automatic connection between two Promi-SDs. Here we name two Promi-SDs as SD1 and SD2 respectively.

• Turn off all the nearby Promi-SD
• Turn on SD1 and SD2 and hardware, reset both of them by pressing Reset Button.
• Press the Pairing Button of SD1 for 2 seconds until Standby LED turns off and Connect LED blinks 3 times every 2 seconds. Keep the power ON.
• Press the Pairing Button of SD2 for 2 seconds until Standby LED turns off and Connect LED blinks 3 times every 2 seconds. Now press again the Pairing Button for 2 seconds until Connect LED blinks every 0.5 second.
• Wait for SD1 & SD2 to be connected for a while until Connect LED’s of SD1 and SD2 is lit in green. It takes about 10 seconds to make a connection. If there are many Bluetooth devices nearby, it will take a little bit more.
• Turn SD1 off and on. Connect LED blinks twice in green every 3 seconds.
• Turn SD2 off and on. Connect LED blinks once in green every 1 second.
• Now a pair of Promi-SD is configured to make an automatic connection, whenever the power goes off and on.

Use this pair of Promi-SD like a virtual serial cable.

* Note: While pairing is progressing through the pairing buttons, the Command Response doesn’t operate automatically. The response messages such as OK, Connect, Disconnect and so on are not sent by Promi-SD.