User's Manual

Enhanced Class 1 Bluetooth v2.1 Module
User’s Guide
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CONN-GUIDE-BT740_v0.2
6.3 ‘AT’ S Registers
These registers are specific to AT protocol operation only and are not accessible from MP protocol mode.
Any S Register marked ‘remapped’ is detailed with the descriptions of the mapped-to S Registers.
Table 6-3: 'AT' S registers
RegNo
Min
Max
Category
Description
0
0
15
SPP
Rings before auto answering an incoming SPP connection.
Setting 0 means a connection is not auto answered.
2
0x21
0x7E
SPP
Escape character used to change from data mode to
command parsing mode when in a data connection.
Three of these character enveloped by delays result in a
transition from data into command mode
504
0
1
General
This register controls what debug shows on the terminal
program during the connection process.
0 – All debug shown.
1 - Inhibits the printing of connection debug on the terminal
screen.
506
0
1
General
If this is set to 1, then AT commands echo back to the host.
This becomes effective after a power cycle. To make
immediate effect on echoes, use the command ATE0 or
ATE1.
Note: This register only specifies the initial state of echoes
on power up.
507
0
1
SPP
When set to 1, which is the default, the DSR modem status
input line enters command mode and/or drop a connection.
When set to 0 the DSR line is not checked for connection
related functionality. This is so that the input can convey a
digital status to the peer using S Registers 651/654 and
661/664 inclusive.
508
Remapped
GAP
To S Reg 9009 (9 in MP Mode see section Standard S
Registers )
509
Remapped
GAP
To S Reg 9010 (10 in MP Mode. See section Standard S
Registers ).
510
Remapped
GAP
To S Reg 9007 (7 in MP Mode. See section Standard S
Registers)
511
Remapped
GAP
To S Reg 9009 (8 in MP Mode. See section Standard S
Registers).
514
2
60
Pairing
Minimum time in seconds to wait for the conclusion of a
pairing operation.
517
2
60
Inquiry
Maximum time in seconds to perform an inquiry.
518
1
255
Inquiry
Maximum number of inquiry responses in an inquiry.