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UM0472 User manual
Bluetooth class 2 evaluation boards GS-BT2416C2DB and GS-BT2416C2DBAT1
Introduction
This user manual details the GS-BT2416C2DB.xxx which is a Bluetooth Class 2 evaluation board for GS-BT2416C2.H and GS-BT2416C2.AT1 Bluetooth modules 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-BT2416C2DB is a board with downloaded FW which enables the user to interface the Bluetooth module with HCI commands. The GS-BT2416C2DBAT1 is a board with downloaded FW which enables the user to create a Bluetooth link with simple AT commands. AT commands are sent by means of the serial line which is accessible by the DB9 connector. The GS-BT2416C2DB.xxx board can be supplied by an external 5 V DC source or via the USB port.
Features

Bluetooth V1.2 board Serial interface on DB9 connector USB connection PCB antenna on board Single 5 V supply voltage CE compliant FCC compliant
FCC ID: S9N16C2
Figure 1.
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GS-BT2416C2DB.xxx board
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October 2007
Rev 1
1/19
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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 FCC Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Label instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 8
Special requirements for modular application . . . . . . . . . . . . . . . . . . . 11 AT commands appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1 8.2 8.3 8.4 8.5 Setup & connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Steps to connect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Macro instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Module BT address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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Point-to-point connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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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 -20C < T < 70C Min 4 -20 Typ 5 Max 6 +70 Unit V C
2
Table 2.
I/O connections
Board connections
Description 1 J1 2 Boot signal - If connected to GND, the module can download - see also JP1
Reset signal - A low level on this pin forces the module to reset state - see also S3
J2
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 module 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 J4 plug, do not connect USB port 1 2 3 4 5 6 7 8 9 GPIO 15 GPIO 14 GPIO 13 GPIO 12 GPIO 11 GPIO 10 GPIO 9 GPIO 8 GPIO 7
J3
J4
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10 GPIO 4 11 GPIO 3 12 GPIO 2 13 GPIO 0
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I/O connections Table 2. Board connections (continued)
Description JP1 JP2 JP3 JP4 JP5 JP6 S1 Boot If connected to GND the module can download DB9 connector connection - see Figure 3: Board schematic on page 6 DB9 connector connection - see Figure 3: Board schematic on page 6 DB9 connector connection - see Figure 3: Board schematic on page 6 DB9 connector connection - see Figure 3: Board schematic on page 6 DB9 connector connection - see Figure 3: Board schematic on page 6
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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 connection is ON (LED ON)
S2 S3 L1 L2
LED showing the presence of the 3.3 V internal voltage - Bluetooth module supply voltage
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Board layout
3
Board layout
Figure 2. Board component layout
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4
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24 23 22
21 20 19 18 17
BOOT RESET USB_DP
L1 GREEN
R2
GPIO1
USB_DN SPI_RXD SPI_TXD SPI_CLK SPI_FRM
RF-GND ANT RF-GND
43 44 45
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Board schematic
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BOOT RESET 1 2 J1 2 1 J4 PLUG GND 3 FOR INTERNAL FLASH PROGRAMMING JP1 S3 Vext+5V +3.3V D1 R4 470 Ohm 5 Vout By Pass GND C2 10n GPIO5 USB +5V 3 2 1 D2 GND D1 U3 USBUF01W6 C11 NM C6 100n U4 ST3232 C7 100n 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) 2 C C3 10u 6.3V 4 C4 100n INHIBIT 3 I/O O/I GND Vcc 1 2 3 5 C5 100n Vin 4 C1 22u 6.3V 1 U2 74V1G66CTR +3.3V U1 LD2985BM33R BY V10-60
+3.3V
S2
R3 10K
Data
3
2
Board schematic
Board schematic
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Command 1
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470 Ohm GPIO5 GPIO6
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 C9 100n
C10 100n GND
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25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 GPIO0 GPIO1 GPIO2 GPIO3 GPIO4 GPIO5 GPIO6 GPIO7 GPIO8 GPIO9 GPIO11 GPIO10 GPIO12 GPIO13 GPIO14 GPIO15 VIN (VDDIO) BT1 42 GND BLUETOOTH MODULE GS-BT2416C2 (UART_RTS) RTS (UART_CTS) CTS (UART_TX) TXD (UART_RX) RXD PCM_A PCM_B PCM_SY NC PCM_CLK (I2C_CLK) I2C1 (I2C_DAT) I2C0 INT1 (JTAG3) TCK (JTAG4) TDO (JTAG0) NTRST (JTAG2) TMS (JTAG1) TDI 41
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
PC DTR PC_RTS PC_RX PC_CTS PC_TX PC DSR JP2
5 9 4 8 3 7 2 6 1
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ANT1 ANTENNA BLUETOOTH
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Downloading
5
Downloading
The user has the possibility to download his own file to the GS-BT2416C2DB:

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 2.4GHZ ISM band and using wideband modulation techniques; Harmonized EN covering essential requirements under article 3.2 of the R&TTE 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
In order to comply with FCC CFR47 Part 15 regulations the following tests have been performed: Table 3. FCC tests
CFR47 part 15 section 15.203 15.247 (b) (4) (i) 15.247 (a) 15.209 (a) (f) 15.247 (a) 15.247 (b) 15.247 (d) 15.247 (d)
Antenna requirements Conducted emission
15.247 (e)
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Radiated emission
Frequency hopping -spread spectrum spec Maximum peak output power 100 kHz Bandwidth of frequency band edges Conducted emission Power spectral density FHSS transmission characteristics
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Result pass pass pass pass pass pass pass pass pass pass
15.247 (i) (47CFR1.1307 (b)(1))
RF human exposure
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UM0472 This board has the following FCC ID: S9N16C2. Figure 5. FCC ID position
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. 2. Note: this device may not cause harmful interference, and this device must accept any interference received, including interference that may cause undesired operation.
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:
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- - - Antenna Caution
Reorient or relocate the receiving antenna Increase the distance between the equipment and receiver Connect the equipment to an outlet on a circuit different from that to which the receiver is connected
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Consult the dealer or an experienced radio/TV technician for help. Our board type GS-BT2416C2DB.xxx is for OEM integrations only. The end-user product will be professionally installed in such a manner that only the authorized antennas are used. Any changes or modifications not expressly 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.
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Certifications
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6.2.2
Label instructions

Module type: Bluetooth class 2 board GS-BT2416C2DB.xxx (GS-BT2416C2.H or GS-BT2416C2.AT1 module + PC 787 carrier board) FCC-ID: S9N16C2
The purpose of this section is to inform you how to specify the FCC ID of our Bluetooth board GS-BT2416C2DB.xxx on your final product. Based on the Public Notice from the FCC, the product in 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: S9N16C2" or "Contains FCC ID: S9N16C2". Any similar wording that expresses the same meaning may be used (see Figure 6 below for an example). Figure 6. FCC ID label
Contains FCC ID : S9N16C2
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Special requirements for modular application
7
Special requirements for modular application
The modular transmitter fulfills the following requirements: 1. The modular transmitter must have its own RF shielding: - 2. The RF module fulfills the emission requirements of the FCC rules without additional shielding. The module has a memory management unit inside of the IC. The processor interfaces with the external application by means of a general purpose I/O (GPIO), Uart, USB, PCM, I2C, SPI. The processor also interfaces the RF part of the module exchanging data and commands with it. Inside the processor flash memory is available to download the customer application and the Bluetooth profiles. The module contains its own voltage regulation. In the event of changes in the supply voltage VCC (for example caused by temperature changes or other effects), the internal voltage will be stabilized.
The modular transmitter must have buffered modulation/data inputs: -
3.
The modular transmitter must have its own power supply regulation: -
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. 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.
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:
7.
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:
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The EUT is compliant with all applicable FCC rules. Detailed instructions are given in the product Users Guide.
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The modular transmitter must comply with any applicable RF exposure requirements. Maximum measured power output: 1,08 mW (0,33 dBm) Maximum antenna gain: 1 dBi = numeric gain 1,259 (see also FCC test report)
Maximum permissible exposure defined in 47 CFR 1.1310: 1 mW/cm. The RF module operates at low power level so it does not exceed the Commission's RF exposure guidelines limits. Furthermore, Spread spectrum transmitters operating according to the Section 15.247 are categorically excluded from routine environmental evaluation.
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AT commands appendix
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8
AT commands appendix
This section is applicable to the evaluation board with the AT command downloaded FW GS-BT2416C2DBAT1. The purpose of this section is to describe all the necessary steps to establish a connection between two Bluetooth GS-BT2416C2DBAT1 evaluation boards in a Serial line /Cable replacement application. (This connection example is also given in the GS-BT2416C2.AT1 datasheet, Appendix A)
8.1
Setup & connect
Two PCs and two GS-BT2416C2DBAT1 boards are needed to perform the connection. Figure 7. Basic setup
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AT commands appendix
8.2
Steps to connect
(Please refer to the GS-BT2416C2.AT1 datasheet Appendix A, for the meaning of the AT commands).

Designate a GS-BT2416C2DBAT1 board to be used as "Client" and it has the address 0080E1000001. Hereafter this board will be referred to as "Client" Designate a GS-BT2416C2DBAT1 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 by 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-BT2416C2.AT1 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"
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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 & available services
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Before establishing a connection, the Client has to know which Bluetooth devices are present and which services are offered, and therefore the Client: - 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 connectable devices. One of the devices should be our SPP Server: +BTINQRES: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
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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-BT2416C2DBAT1 board an LED is connected to GPIO1 and therefore the connection is also shown by an LED on. GPIO3 on the Client board must be now 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).
8.3
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. 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+BTDMODE=0
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Server AT+BTMACROSTART 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" AT+BTMACROSTOP
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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AT commands appendix Note that:

UM0472
When the address module to connect to 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 interval. 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.
8.4
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-BT2416C2DBAT1 board could 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
8.5
Point-to-point connection
Modules with AT commands firmware can only perform point-to-point connections. 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 8 shows an example of a Client C1 which needs to connect to Server S1,S2,..Sn: Figure 8. 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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9
Revision history
Table 7.
Date 22-Oct-2007
Document revision history
Revision 1 Initial release Changes
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Please Read Carefully:
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