User's Manual

Class 1 Bluetooth v2.0 Module
User’s Guide
Americas: [phone] Option 2
Europe: [phone]
Hong Kong: [phone]
www.lairdtech.com/bluetooth
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CONN-GUIDE-BT730_v0.9
Error
Description
32
Analogue Value cannot be written as it is set for input
33
S Register value is invalid
34
Both L and R modifier cannot be specified in ATD command
35
Invalid Major Device class – valid value in range 0x00 to 0x1F inclusive
36
Pairing in progress – Command cannot be actioned – try again later
37
Invalid Sniff parameter specified.
E.g. new Attempt value greater than MinInterval. Solution is to first increase
MinInterval and re-enter the Attempt value.
38
Get Remote Friendly name Failed
39
Failed to change mode to Multipoint
40
7 Bit mode requires parity to be even or odd
41
Stream error
42
Stream pending
43
Unknown AG command
44
Busy try later
45
Not allowed – call waiting has not been enabled by peer or in hostless mode
46
GPIO line can’t be set as it has not been configured as an output
6.9 Factory Default Mode
Laird devices are capable of operating at a wide range of baud rates. S Registers 520 and 521 allow the
baud rate to be easily set. The baud rate clock generator in the Laird device is more versatile than one
available in a standard 16550 UART commonly available in PCs.
In fact, as long as the equation BAUDRATE * 0.004096 produces an integer value, there is 0% error in
clocking for that baud rate.
Because of this, it is possible to set a baud rate that a PC cannot cope with and, in that circumstance, it is
virtually impossible to communicate with it.
For this type of circumstance, the Laird device comes out of reset using 9600,N,8,1 comms settings for
exactly 750 milliseconds and then reverts to the comms parameters as per the S Registers.
If the host sends the string !<BISM>!<cr> where <cr> is the carriage return character within that 750 ms
period, then the module remains at 9600,N,8,1 and configures itself using factory default S Register
values.
6.10 Miscellaneous Features
This chapter describes various features which cannot be categorized appropriately.
6.10.1 RI dependent Start-up Mode
The UART_RI line can be configured as an input and on power its state can be used to force the device
into one of two modes. See description for S Registers 565 to 569 inclusive for more details.
For example, the feature could allow a device to make an outgoing connection if RI is in one state, and be
ready for an incoming connection in the other.