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UM0471 User manual
Bluetooth(R) class 1 evaluation boards using: GS-BT2416C1DB and GS-BT2416C1DBAT1
Introduction
This user manual details the GS-BT2416C1DB.xxx which is a Bluetooth(R) class 1 evaluation board including an RF antenna. The suffix xxx identifies the firmware release. There is no suffix for HCI commands and AT1 is the suffix for AT commands. The GS-BT2416C1DB is a board with downloaded FW which enables the user to interface the Bluetooth(R) module with HCI commands. The GS-BT2416C1DBAT1 is a board with downloaded FW which enables the user to create a Bluetooth(R) link with simple AT commands. AT commands are sent by means of the serial line which is accessible by the DB9 connector. The GS-BT2416C1DB.xxx board can be supplied by an external 5 V DC source or via the USB port.
Features

Bluetooth(R) V1.2 board Serial interface on DB9 connector USB connection PCB antenna on board Single 5 V supply voltage CE / FCC compliant
Figure 1.
GS-BT2416C1DB.xxx board
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May 2008
Rev 2
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Contents
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Contents
1 2 3 4 5 6 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 I/O connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Board schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Downloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1 6.2 CE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 FCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.2.1 6.2.2 6.2.3 FCC statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Label instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Special requirement for modular application . . . . . . . . . . . . . . . . . . . . . 10
7
AT commands appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1 7.2 7.3 7.4 7.5 Setup and connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Steps to connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Macro instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Module BT address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Point-to-point connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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Recommended operating conditions
1
Recommended operating conditions
Table 1.
Symbol VDD Tstg
Recommended operating conditions
Parameter Board supply voltage Operating ambient temperature Conditions -20 C < T < 70 C Min 4 -20 Typ 5 Max 6 +70 Unit V C
2
I/O connections
Table 2. Board connections
Description 1 J1 2
Boot signal - If connected to GND, the module can download - see also JP1.
Reset: A low level on this pin forces the module to reset state; a 100 k / 100 nF is present on the board.- see also S3. USB port When the USB port is connected, the 5 V USB is used (by the 3.3 V regulator) to supply the BT module and the board itself. When the USB port is used, do not supply an ext. 5 V to J4 power plug. The USB port is not used for AT version. Serial line port (DB9 male connector) A level translator to adapt the BT digital levels to the RS232 standard levels is present on the board. Vcc power supply plug (5 V) When 5 V input is used on this plug, do not connect USB port.
J2
J3
J4
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I/O connections Table 2. Board connections (continued)
Description 1 2 3 4 5 6 J5 7 8 9 GPIO 15 GPIO 14 GPIO 13 GPIO 12 GPIO 11 GPIO 10 GPIO 9 GPIO 8 GPIO 7
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10 GPIO 4 11 GPIO 3 12 GPIO 2 13 GPIO 0 JP1 JP2 JP3 JP4 JP5 JP6 S1 Boot. If connected to GND, the module can download
DB9 connector connection - see Figure 3: Board schematic DB9 connector connection - see Figure 3: Board schematic DB9 connector connection - see Figure 3: Board schematic DB9 connector connection - see Figure 3: Board schematic DB9 connector connection - see Figure 3: Board schematic
N.O. push button connected to BT module GPIO6; when activated a low level is applied to GPIO6, otherwise GPIO6 is at high level. Not used for AT commands version Switch connected to GPIO3 (10 k pull-up to 3.3 V) In AT version this switch is used to select command / data mode Reset - push button acting on the module reset pin. LED connected to BT module GPIO1 On AT version this LED shows when a Bluetooth(R) connection is ON (LED ON)
S2 S3 L1
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L2
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LED showing the presence of the 3.3 V internal voltage - Bluetooth(R) module supply voltage
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Board layout
3
Board layout
Figure 2. Board component layout
R4
1
J5
13 Command Data
ANT1 BT1 U1 CLASS 1 MODULE
D1
1
U3 JP5 R3 JP2
C13 JP3
1
1 6 9
5
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4
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Command 1
C9 100n C10 100n
19 20 21 22 23 24 25 26 27 28 29 30 31 32
(JTAG1) TDI (JTAG4) TDO (JTAG2) TMS (JTAG0) NTRST (JTAG3) TCK (I2C_DAT) I2C0 (I2C_CLK) I2C1 INT1 PCM_SYNC PCM_CLK PCM_A PCM_B USB_DN USB_DP
51 50 49
GNDA ANT GNDA
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2 +3.3V U1 5 Vout By Pass +3.3V 2 U2 74V1G66CTR Vcc C GPIO5 USB +5V 3 2 1 D2 GND D1 U3 USBUF01W6 C7 100n C6 100n U4 ST3232 C8 100n D3 3.3V D4 +3.3V 4 5 6 J2 USB CON. 1 2 3 4 USB (Vcc) USB (D-) USB (D+) USB (GND) 4 5 C5 100n C3 10u 6.3V C4 100n D1 BYV10-60 GND INHIBIT 3 3 Vin 4 C2 10n 1 Vext+5V J4 PLUG 1 LD2985BM33R
Board schematic
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Figure 3.
R5 470 Ohm
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C1 22u 6.3V
L2 GREEN
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J5
1 2 3 I/O O/I GND
Board schematic
1 2 3 4 5 6 7 8 9 10 11 12 13
Board schematic
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+3.3V
C11 NM
S2
R4 10K
Data
3
2
16 15 14 13 12 11 10 9 Vcc C1+ GND V+ T1out C1R1in C2+ R1out C2T1in VT2in T2out R2out R2in
1 2 3 4 5 6 7 8
JP2
+3.3V
R1 10K GPIO6 GPIO5 +3.3V R3 100K 1.8V 3.3V GNDA 2.7V 41 42 43 44
so Ob 33 34 35 36 37 38 39 40
(UART_RX) RXD (UART_TX) TXD (UART_CTS) CTS (UART_RTS) RTS SPI_FRM SPI_CLK SPI_TXD SPI_RXD
PC DSR PC_TX PC_CTS PC_RX PC_RTS PC DTR GND
1 6 2 7 3 8 4 9 5
J3
R2 470 Ohm GPIO1 RESET BOOT UART10 UART11 C13 10n 45 46 47 48
S1
+3.3V
18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 GPIO15 GPIO14 GPIO13 GPIO12 GPIO11 GPIO10 GPIO9 GPIO8 GPIO7 GPIO6 GPIO5 GPIO4 GPIO3 GPIO2 GPIO1 GPIO0 3.3V GND S3
JP3
JP4
JP5
JP6
BT1 BLUETOOTH MODULE GS-BT2416C1 ANT1
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L1 GREEN
JP1
FOR INTERNAL FLASH PROGRAMMING
BLUETOOTH ANTENNA C12
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RESET BOOT
2 1
J1
39pF
NM = NOT MOUNTED
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C15 1pF
C14 1pF
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* Only in alternative to C12
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Downloading
5
Downloading
The user has the possibility to download his own file to the GS-BT2416C1DB.xxx:

Connect the board to a PC using an RS232 cable connected to COM1 / COM2 Put a jumper on JP1 (Boot pin to low level) Connect the power supply cable to the board at +5 V ext Vin Open the "flash loader" program Choose UART in the transportation layer section Choose the appropriate COM1 / COM2 port Choose the firmware to be downloaded in the "firmware" section Flash loader info
Figure 4.
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Press start: on the dialog bar "reset the board" appears Power the board (a reset is generated): on the dialog bar the % of the downloading appears.
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Certifications
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6
6.1
Certifications
CE
Measurements have been performed in accordance with (report available on request):
EN 300 328 V 1.6.1 (2004-11): "Electromagnetic compatibility and radio spectrum Matters (ERM); wideband transmission systems; data transmission equipment operating in the 2.4 GHz ISM band and using wideband modulation techniques; Harmonized EN covering essential requirements under article 3.2 of the RandTTE directive" EN 301 489-17 V 1.2.1: 2002: " Electromagnetic compatibility and radio spectrum Matters (ERM); electromagnetic compatibility (EMC) standard for radio equipment and services; Part 17: Specific condition for 2.4 GHz wideband transmission systems and 5 GHz High performance RLAN equipment." EN 60950-1: "Information technology equipment - safety - part 1: general requirements".
6.2
FCC
FCC part 15, subpart C This board has the following FCC ID: FCC ID:S9NBT2416C1DB Figure 5. Label position
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Certifications
6.2.1
FCC statement
This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Note:
This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected
Consult the dealer or an experienced radio/TV technician for help.
Antenna
Our board type GSBT2416C1DB is for OEM integrations only. The end-user product will be professionally installed in such a manner that only the authorized antennas are used. Caution: Any changes or modifications not expressed approved by the party responsible for compliance could cause the module to cease to comply with FCC rules part 15, and thus void the user's authority to operate the equipment.
6.2.2
Label instruction
Module type: Bluetooth(R) class 1 board, GSBT2416C1DB (GSBT2416C1DB module + PC 788 carrier board)
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FCC-ID:
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S9NBT2416C1DB
This intends to inform you how to specify the FCC ID of our Bluetooth(R) board GSBT2416C1DB on your final product.
Based on the public notice from FCC, the product into which the our transmitter module is installed must display a label referring to the enclosed module. The label should use wording such as "contains transmitter module FCC ID: S9NBT2416C1DB or "contains FCC ID: S9NBT2416C1DB, any similar wording that expressed the same meaning may be use.
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Certifications It shows an example below Contains FCC ID: S9NBT2416C1DB
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6.2.3
Special requirement for modular application
The following requirements are fulfilled: 1. The modular transmitter must have its own RF shielding: The RF module fulfils the emission requirements of the FCC rules without additional shielding. 2. The modular transmitter must have buffered modulation/data inputs: The module has a memory management unit inside of the IC. The processor interfacing with the external application by means general purpose I/O (GPIO), UART, USB, PCM, I2C, SPI. The processor interfaces also the RF part of the module exchanging data and commend with it. Inside the processor a flash memory is available to download the customer application and the Bluetooth(R) profiles. 3. The modular transmitter must have its own power supply regulation: The module contains an own voltage regulation. In case of changes in the supply voltage VCC (for example caused by temperature changes or other effects), the internal voltage will be stabilized. 4. The modular transmitter must comply with the antenna requirements of Section 15.203 and 15.204:
The RF module is for OEM (original equipment manufacturer) integration only. The end-user product will be professionally installed in such a manner that only the authorized antenna is used. 5. 6. The modular transmitter must be tested in a stand-alone configuration: The modular transmitter must be labelled with its own FCC ID number: The RF module was tested in a stand-alone configuration. The RF module will be labelled with its own FCC ID number. When the module is installed inside the end-product, the label is not visible. The OEM manufacturer is instructed how to apply the exterior label.
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The modular transmitter must comply with any specific rule or operating requirements applicable to the transmitter and the manufacturer must provide adequate instructions along with the module to explain any such requirements:
The EUT is compliant with all applicable FCC rules. Detail instructions are given in the product users guide. The modular transmitter must comply with any applicable RF exposure requirements.
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Certifications
Table 3.
Channel
RF exposure evaluation distance
Frequency Output power to antenna (Erp) (dBm) 15,47 15.75 14.93 Power density @ 20 cm (mW/cm2) 0,009 0,008 0,008 Distance where the exposure level reaches the limit (cm) 1,879 1,941 1,764 Limits (mW/cm2) 1 1 1
(No.) 00 38 78
(MHz) 2402,00 2440,00 2480,00
The RF module operates at low power level so it does not exceed the commission's RF exposure guidelines limits; furthermore, spread spectrum transmitters operate according to the section 15.247 are categorically excluded from routine environmental evaluation.
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AT commands appendix
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7
AT commands appendix
This section is applicable to the evaluation board with the AT command downloaded FW (GS-BT2416C1DBAT1). The purpose of this section is to describe all the necessary steps to establish a connection between two Bluetooth(R) GS-BT2416C1DBAT1 evaluation boards in a serial line /cable replacement application. (This connection example is also given in the GS-BT2416C1.AT1 datasheet, Appendix A.
7.1
Setup and connect
Two PCs and two GS-BT2416C1DBAT1 boards are needed to perform the connection Figure 6. Basic setup
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AT commands appendix
7.2
Steps to connect
(Please refer to the GS-BT2416C1.AT1 datasheet, Appendix A for the meaning of the AT commands)

Designate a GS-BT2416C1DBAT1 board to be used as "client" and suppose it has the address 0080E1000001. Hereafter this board will be referred to as "client" Designate a GS-BT2416C1DBAT1 board to be used as "server" and suppose it has the address 0080E1000002. Hereafter this board will be referred to as "server" Connect the server board to a PC using an RS232 cable Connect the client board to a PC using an RS232 cable Open the hyperterminal program on both PCs and set the communication line with the following parameters: - - - - - - - - Select the proper COM line (COM1, COM2......) Baud rate: 9600 (default baud rate of GS-BT2416C1/AT module) Data bits: 8 Parity: none Stop bits: 1 Flow control: none In ASCII setup, set flag line ends with line feed In ASCII setup, set flag echo characters typed locally

Power the client board with the external 5 V: on the PC screen connected to the client should appear + READY Power the server board with the external 5 V: on the PC screen connected to the Server should appear + READY Configure the client board using the following commands in Table 4: (GPIO3 client must be low to select command mode - S2 switch in command mode). Client setup
Command
Table 4.
AT
AT+BTCMODE = 0 AT+BTPMODE = 1
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AT+BTDMODE = 0 AT+BTSECMODE = 1 AT+BTENCMODE = 0 AT+BTNAME = "SPP client" AT+BTCLASS = 52020C
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Answer
Notes Check module ready
Not discoverable
Set client name
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AT commands appendix
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Configure the server board using the following commands in Table 5: (GPIO3 Server must be low to select command mode- S2 switch in command mode) Server setup
Command Answer ok ok ok ok ok ok ok ok ok ok Pin code Set server name Discoverable Notes Check module ready
Table 5.
AT AT+BTCMODE = 1 AT+BTPMODE = 1 AT+BTDMODE = 1 AT+BTSECMODE = 1 AT+BTENCMODE = 0 AT+BTPINCODE = "1234" AT+BTNAME = "SPP server" AT+BTCLASS = 52020C AT+BTREGPORT = "SPP port"
Name of service offered
After the configuration of the server board, GPIO3 must be put HIGH to select DATA MODE which enables the Server board to receive and transmit DATA.
Inquiry and available services
Before establishing a connection, the Client has to know which Bluetooth(R) devices are present and which services are offered, and therefore the client: 1. first performs the inquiry by the command: AT+BTINQ=xx where xx is the inquiry time (i.e. 10 sec -> AT+BTINQ=10). The answer is a list of present Bluetooth(R) connectable devices. One of the devices should be our SPP Server: +BTNQRES:0080E1000002,"SPP Server" OK then asks which kind of service is available with the command: AT+BTRPORTS=0080E1000002 The answer is: +BTRPORT:"SPP Port",1 serial port profile, port 1 (can be 1,2...) OK
2.
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Once the client knows the device present and the service offered, the Client finalizes the connection with the command: AT+BTCONNECT=0080E1000002,1,"1234",1,0 OK
At this point the connection is established and GPIO1 (indicating the connection status) on both Client and Server boards becomes high. On the GS-BT2416C1DBAT1 board an LED is connected to GPIO1 and therefore the connection is also shown by an LED which is on. GPIO3 on the client board must now be put at HIGH level allowing the client to send and receive DATA from the server.
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AT commands appendix
Disconnection
To disconnect, the client has to put its GPIO3 LOW (Command mode) (changing from high to low on GPIO3 appears on the client PC screen as +READY) and sends the command: AT+BTDISCONNECT OK The result is the disconnection of the link client / server, and GPIO1 on both client and Server boards returns to low (the LEDs go off).
7.3
Macro instructions
The MACRO concept with the commands AT+BTMACROSTART, AT+BTMACROSTOP and AT+MACROCLEAR has been introduced with version 1.2.1.8 of AT1 SW. These commands work in such a way that all commands written between the AT+BTMACROSTART and AT+BTMACROSTOP commands are stored inside the internal flash memory and executed at each power up of the module.
Note:
When you insert a command between MACROSTART and MACROSTOP you do not have immediate execution of the command, but only storing in flash memory. The module answers with OK or ERROR from a syntax point of view. Execution is active at the next power on. That means, after writing the commands between the two macro commands, the module could work in stand-alone without needing to program it at each power on. The MACROCLEAR command erases all commands stored.
As an example: suppose the previous modules always have the final address 01 (client) and 02 (server) and we already know which connection to get. Write the following sequence of commands in client and server module (see Table 6). After the MACROSTOP command, they are stored in the internal memory of the corresponding module. Table 6. Macro example
AT+BTMACROSTART AT+BTCMODE = 0
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AT+BTPMODE = 1 AT+BTDMODE = 0 AT+BTSECMODE = 1 AT+BTENCMODE = 0 AT+BTNAME = "SPP client" AT+BTCLASS = 52020C AT+BTCONNECT = 0080E1000002,1,"1234",10,5 AT+BTMACROSTOP
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Client
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Server AT+BTMACROSTART AT+BTCMODE = 1 AT+BTPMODE = 1 AT+BTDMODE = 1 AT+BTSECMODE = 1 AT+BTENCMODE = 0 AT+BTPINCOD = "1234" AT+BTNAME = "SPP server" AT+BTCLASS = 52020C AT+BTREGPORT = "SPP port" AT+BTMACROSTOP
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AT commands appendix Note that:

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When the address module to connect is known, the inquiry command can be omitted The BTCONNECT command has been set to 10 retries at 5 sec intervals.
After the modules have been programmed, you can power off and power on again the modules themselves. At a certain point the modules will be connected to each other (LED on) without any intervention. The sequence of powering on does not matter. The only rule to follow is that, once the Client has been powered on, the Server must be powered in the time set by the 10 retries at 5 sec intervals. During the macro execution the module answers with "OK" or "ERROR" for each command executed. This feedback can be eliminated using the AT+ECHO=OFF command.
7.4
Module BT address
Each module has its own address which identifies the module itself in the network. The above examples were used with addresses 0080E1000001 and 0080E1000002.
Modules on the GS-BT2416C1DBAT1 board may have different addresses. Before starting to send commands, the module address can be found with the command AT+BTSETTINGS=? which shows the relevant information of the module including the BT address.
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AT commands appendix
7.5
Point-to-point connections
Modules with AT command firmware can only perform point-to-point connections which means that only one connection can be activated at once. A module can be connected to several other modules, but it has to disconnect from the previous connection before activating a new one. Figure 7 shows an example of Client C1 which needs to connect to Server S1,S2,..Sn: Figure 7. Point-to-point connection
S1
C1
S2
In this case the following procedure must be used:

C1 establishes the connection to S1 to exchange data C1 disconnects from S1 using the command AT+BTDISCONNECT C1 establishes the connection to S2 to exchange data C1 disconnects from S2 using the command AT+BTDISCONNECT C1 establishes the connection to Sn to exchange data... and so on.
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Revision history
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8
Revision history
Table 7.
Date 22-Oct-2007 23-May-2008
Document revision history
Revision 1 2 Initial release Added: Section 6.2: FCC on page 8 Changes
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Please Read Carefully:
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