Hi,

I did hack an old Motorola access point, and I found a BTM-220A module 
inside.
I used it to build an interface for my ATmega protoboard, like schematic 
from Micropet Basisboard (googled).
Attached is a photo of the hand-made board.

Everything seems to work, so I receive informations through Realterm. 
However, when I sent a command "AT", the

module change to DUT mode (I supouse Device Under Test mode) and it 
doesn't accept serial commands anymore.

I did tryed to pull PIO4 up to restore configurations, but didn't work.

Any idea?

Well, when I power-on the board (first time), I did capture the 
following messages through Realterm:

1

ATE

2

3

==============================

4

BS-P100 MA

5

BUILD MA2.0.031  DATE 20060926

6

==============================

7

[RPS]

8

========================

9

m = FFFF8093

10

BM = 0

11

T1 = 800

12

T2 = 70

13

DT = 0

14

C = 55

15

========================

16

17

license:VALID

18

AccessM < NA >

19

BCCMD_CFM

20

MB ID : 0xF7B

21

[HookOn] CH0

22

23

==========================

24

[BDADDR] 00:07:88:47:2E:48

25

[PINCODE] 544295

26

==========================

27

28

W L Name

29

Sec. : 0x03, Enc. : 0x00

30

[dsp_setup_pre]

31

[dsp_R]

32

[dsp_RR]

33

[dsp_setup]

34

.................................................................

35

[daa_R]

36

[daa_RR]

37

DAA Reg Ctrl2: 0x00

38

DAA Reg Ctrl2: 0x00

39

DAA Reg Ctrl2: 0x00

40

DAA Reg Ctrl2: 0x00

41

DAA Reg Ctrl2: 0x00

42

0th DAA err

43

DAA: ISR

44

AccessM < GA >

45

DAA_CID_ON: 0x00

46

47

CH0 _CUT

48

AA : 12sec

49

AA : 12sec

50

AA : 12sec

51

AA : 12sec

... and so, after 12 seconds, repeatedly AA : 12sec.

So, I sent the command "AT" through Realterm and immediatly, the module 
restarts informing "Reboot DUT". After

this, the module was entered in DUT mode, and did not accepted any 
command (as showing in the attached

prinscreen).

I would like to interface this Bluetooth module with an ATmega32 in SPP 
mode. Any suggestions of how to leave this

DUT mode?

Thank you in advance.

Regards.