Amber Wireless AMB8350 User manual

Manual AMB8350
Version 1.2
SW-V1.3
AMBER wireless GmbH
Albin-Köbis-Straße 18
51147 Cologne
Tel. [phone]
Fax [phone]
E-mail [email protected]
Internet http://www.amber-wireless.de

AMB8350 Manual V1.2 Page 2 of 21 As of: 9.2.2007
List of contents
1 Technical description of the radio modem AMB8350 ....................................................... 3
2 Pin connections, dimensions, technical data.................................................................... 4
2.1 Pin connections of the pin connector ST1....................................................................... 4
2.2 Antenna input.................................................................................................................. 4
2.3 Status LEDs.................................................................................................................... 5
2.3.1 Meaning of the LEDs..................................................................................................................5
2.3.2 Pin connection of external LEDs ................................................................................................5
2.3.3 Pin connection of the LED pin connector ST4 ...........................................................................5
2.4 Dimensions and weight................................................................................................... 5
2.5 Technical data ................................................................................................................ 6
2.5.1 General parameters ...................................................................................................................6
2.5.2 RF parameters ...........................................................................................................................6
2.5.3 Channel frequency allocation and use table ..............................................................................7
2.6 Transmission Range and improvement........................................................................... 8
2.7 Note on operation of the modules ................................................................................... 8
3 Configuration with AT instructions .................................................................................... 9
3.1 Switch to the instruction level.......................................................................................... 9
3.2 AT instruction set .......................................................................................................... 10
3.2.1 General ....................................................................................................................................10
3.2.2 AT instructions .........................................................................................................................10
3.2.3 AT-S Register...........................................................................................................................12
3.2.4 Extended AT commands..........................................................................................................14
4 Configuration with “AMBER wireless Config Center” (ACC) ......................................... 16
5 Description of radio modem modes................................................................................. 17
5.1 Operating mode 1, transmission addressed, secured with Acknowledge...................... 17
5.2 Operating mode 2, transparent transmission, without Acknowledge or CRC ................ 17
5.3 Operating mode 3, transmission addressed, without Acknowledge, with CRC.............. 17
5.4 Operating mode 4 equals mode 3 with additional ETX sequence .................................. 17
5.5 Operating mode 5, transmission addressed, secured with Acknowledge 57.6 .............. 18
5.6 Handshake mode 1 collision detection.......................................................................... 18
6 Delay times as a result of radio data transmission......................................................... 19
6.1 Internal data handling ................................................................................................... 19
7 Statement of compliance .................................................................................................. 20
8 Important notes ................................................................................................................. 21
8.1 Disclaimer of liability ..................................................................................................... 21
8.2 Trademarks .................................................................................................................. 21
8.3 Limitation of use............................................................................................................ 21

AMB8350 Manual V1.2 Page 3 of 21 As of: 9.2.2007
1 Technical description of the radio modem AMB8350
With the design of the new data radio modem AMB8350 we are continuing on the consistent
path of implementing customer wishes and using new, powerful processors. New functions
have been integrated in the AMB8350, which simplify the connection to existing systems. The
radio modem AMB8350 is compatible with OPC1426 and is consequently both a complement
and replacement. Compared to the previous model important RF characteristics like large
signal resistance, channel selection and receiver sensitivity have been considerably improved.
It is distinguished by its small, compact design and the combination of radio module and
transmission software. The unit consists of a FM synthesizer-transceiver, which operates in the
frequency band 868MHz and a controller unit with RS232 port. Connection to an RS232 port
and setting up a data radio transmission can be done quickly.
The module has a command set of various transmission modes, which can be individually
adapted to the application as required.
•addressed point to point or point to multi-point transmission with acknowledge
•unaddressed, unsecured transparent transmission (broadcast)
•addressed transmission without acknowledge with CRC check and/or ETX
The parameter assignment of the radio module occurs via the serial RS232 port. Two
possibilities are available as user interface:
•configuration program “AMBER wireless Config Center” (ACC)
•terminal program e. g. “HyperTerminal“ using AT commands
Thanks to its module character, the AMB8350 can be integrated without great effort in already
existing devices or systems and can be directly employed by the user on account of its general
authorisation. The 868 MHz band is a frequency band authorised across Europe.
Characteristics
•Receiver sensitivity typically of -108dBm
•Transmitting power typically 13dBm = 20mW
•Range up to 1,000m with clear visibility and corresponding antenna positioning
•Bit transparent transmission without instruction level (cable replacement!)
•Different transmission modes (broadcast, transmission protocol)
•Individual addressing of an AMB8350
•Complete RS 232 interface according to V.24 standard
•Serial data rates of 110 to 115.200 baud configurable
•RF data rate 10 or 57.6kbps configurable
•Data security through CCITT 16 bit check sum protection of the transmitted data
•Parameter assignment via RS232 with Windows configuration software or AT
instructions
•Possibility of firmware updates via RS232 with the help of ACC
•Voltage supply 4.0V – 10V
•Small dimensions and modular design of the device
•Europe-wide use not subject to registration

AMB8350 Manual V1.2 Page 4 of 21 As of: 9.2.2007
2 Pin connections, dimensions, technical data
2.1 Pin connections of the pin connector ST1
The pitch distance of the pin connectors is 2.54mm.
AMB8350 pin connector ST1 PC SUB-D-9 w
PIN Name Meaning Direction Name Pin
1 NC No function - - -
2 GND Ground - GND 5
3 VCC Supply voltage +(4,0...10,0)V - - -
4 CTS Clear to send Input RTS 7
5 RTS Request to send Output CTS 8
6 TxD Transmit data Output RxD 2
7 RxD Receive data Input TxD 3
8 DTR Data terminal ready Input DSR 6
9 DCD Data carrier detect Output DCD 1
2.2 Antenna input
Possible versions are BNC or SMA print socket, straight or angled or customised RF coaxial
cable.
Pin connection of the pin connector ST2
There are additional I/O ports of the controller on the pin connector ST2 (not embedded). In the
current software version these ports are not yet supported and hence offer no function.
DCD
DTR
RxD
TxD
RTS
CTS
VCC
GND
NC
1
6
Antenna
connection
Solder bridge
SJ1 LED
ST1
ST4
1

AMB8350 Manual V1.2 Page 5 of 21 As of: 9.2.2007
2.3 Status LEDs
2.3.1 Meaning of the LEDs
Colour Function Action Reaction
Green Rx Receipt of data flashes fast
Yellow Status
Module in AT command
mode
Module is operational
flashes fast
flashes every second
Red Tx Transmission of data flashes fast
2.3.2 Pin connection of external LEDs
The LED signals are located additionally on the multi-point connector ST4 so that, for instance,
LEDs can be externally mountable. If external LEDs are used, the LEDs on the AMB8350 must
be switched off to avoid overloading the ports of the controller. To switch off the LEDs the
solder bridge SJ1 (see illustration above) must be removed. The series resistors of the LEDs
are already on the mainboard, so that external LEDs without series resistors can be used. The
value of the series resistors on the mainboard is 330 Ohm, which means given an LED voltage
of, for instance 1.6V, approximately 5 mA would flow through the LED.
2.3.3 Pin connection of the LED pin connector ST4
AMB8350 pin connector ST4 (LEDs)
PIN Signal
1 VCC +3.3V (anode TX-LED)
2 switched GND (cathode TX-LED)
3 VCC +3.3V (anode status-LED)
4 switched GND (cathode status-LED)
5 VCC +3.3V (anode RX-LED)
6 switched GND (cathode RX-LED)
Position and pinout ST4: see illustration of the data radio module above
2.4 Dimensions and weight
Dimensions without antenna socket: (80.0 x 38.0 x 12.5) mm
Weight without antenna socket: 23g

AMB8350 Manual V1.2 Page 6 of 21 As of: 9.2.2007
2.5 Technical data
2.5.1 General parameters
Parameters Min. Typ. Max. Remark
Supply voltage, Vcc 4.0V 5.0V 10.0V
Power consumption Rx (without
RS232) 43mA 47mA 50mA no ext. device on RS232
Power consumption Rx (with
RS232) 48mA 52mA 55mA with ext. device on RS232
Power consumption Tx (without
RS232) 90mA 95mA 105mA no ext. device on RS232
Power consumption Tx (with
RS232) 95mA 102mA 110mA with ext. device on RS232
Service temperature -10°C 55°C
Baud rate of the RS232 110bps 9,600bps 115,200bps configurable (ats1=x,x,x,x)
Data format of the RS232 7n1 8n1 8o2 configurable (ats1=x,x,x,x)
Handshake of the RS232 Xon/Xoff without RTS/CTS configurable (ats2=x)
2.5.2 RF parameters
Parameters Min. Typ. Max. Remark
Frequency range** 868.059MHz 869.426MHz 869.621MHz 41 channels (atcx)
See restrictions in 2.5.3
Duty cycle** <0.1% <10% 100%
In relation to one hour
Depending on traffic
frequency
See restrictions in 2.5.3
Transmitting power on
50Ω** -10dBm* 13dBm 14dBm *configurable (atpx) See restrictions in 2.5.3
Input sensitivity -106dBm -108dBm -110dBm BER ≤0,1%
RF gross data rate 1 10kbaud RF data rate 1 (Manchester)
Net data transfer rate 1 3500bit/s 4300bit/s 4700bit/s RF data rate 1 (Manchester)
Frequency separation 1 10kHz 12kHz 18kHz RF data rate 1 (Manchester)
Channel raster 1 39kHz RF data rate 1 (Manchester)
RF gross data rate 2 57.6kbaud RF data rate 2 (NRZ)
Net data transfer rate 2 25,000bit/s 29,000bit/s 31,000bit/s RF data rate 2 (NRZ)
Frequency separation 2 57.6kHz RF data rate 2 (NRZ)
Channel raster 2 200kHz RF data rate 2 (NRZ)
See S-register 6
Frequency accuracy -3KHz 0 kHz +3kHz
Size of the internal serial
receive buffer 300 bytes
If there are more than 280
bytes in the internal buffer, a
data stop is signalled via the
RTS with the handshake
used
Package size (user data
content)
via radio
1 byte 256 bytes The package size is variable
depending on the data yield
** The user is responsible of the duty cycle compliance, the choice of the transmitting frequency and the
adjustment of the transmitting power in accordance with the table in chapter 2.5.3.

AMB8350 Manual V1.2 Page 7 of 21 As of: 9.2.2007
2.5.3 Channel frequency allocation and use table
Channel
Transmitting
frequency
Max
authorised
duty cycle
Max
authorised
transmitting
power Application
old
channel number
OPC1425 and
OPC1426 to SW-
V2.2
0 868.059 MHz 1% 14 dBm authorised
1 868.098 MHz 1% 14 dBm authorised
2 868.137 MHz 1% 14 dBm authorised
3 868.176 MHz 1% 14 dBm authorised
4 868.215 MHz 1% 14 dBm authorised
5 868.254 MHz 1% 14 dBm authorised
6 868.293 MHz 1% 14 dBm authorised
7 868.332 MHz 1% 14 dBm authorised
8 868.371 MHz 1% 14 dBm authorised
9 868.410 MHz 1% 14 dBm authorised
10 868.449 MHz 1% 14 dBm authorised
11 868.488 MHz 1% 14 dBm authorised
12 868.527 MHz 1% 14 dBm authorised
13 868.566 MHz 1% 14 dBm authorised
14 868.605 MHz 0.1% 10 dBm not authorised
15 868.645 MHz 0.1% 10 dBm not authorised
16 868.684 MHz 0.1% 10 dBm not authorised
17 868.723 MHz 0.1% 14 dBm not authorised
18 868.762 MHz 0.1% 14 dBm authorised
19 868.801 MHz 0.1% 14 dBm authorised
20 868.840 MHz 0.1% 14 dBm authorised
21 868.879 MHz 0.1% 14 dBm authorised
22 868.918 MHz 0.1% 14 dBm authorised
23 868.957 MHz 0.1% 14 dBm authorised
24 868.996 MHz 0.1% 14 dBm authorised
25 869.035 MHz 0.1% 14 dBm authorised
26 869.074 MHz 0.1% 14 dBm authorised
27 869.113 MHz 0.1% 14 dBm authorised
28 869.152 MHz 0.1% 14 dBm authorised
29 869.191 MHz 0.1% 14 dBm not authorised
30 869.230 MHz 0.1% 10 dBm not authorised
31 869.270 MHz 0.1% 10 dBm not authorised
32 869.309 MHz 0.1% 10 dBm not authorised
33 869.348 MHz 0.1% 10 dBm not authorised
34 869.387 MHz 0.1% 10 dBm not authorised
35 869.426 MHz 10% 27 dBm authorised
15
36 869.465 MHz 10% 27 dBm authorised
16
37 869.504 MHz 10% 27 dBm authorised
17
38 869.543 MHz 10% 27 dBm authorised
18
39 869.582 MHz 10% 27 dBm authorised
19
40 869.621 MHz 10% 27 dBm authorised
20
Note on duty cycle classes according to EN300220-1
DC class 1: <0.1% DC class 2: <1.0% DC class 3: <10% DC class 4: up to 100%

AMB8350 Manual V1.2 Page 8 of 21 As of: 9.2.2007
2.6 Transmission Range and improvement
The 868MHz radio modem consists of a high performance transmitter and a receiver with high
sensitivity. Based on that parameters ranges of more than 1.000m at free line of sight and
optimal environmental conditions.
To realise the optimal and best range following point should be considered:
•at the antenna base a groundplane must be
•Hold large distance to ground as possible ( > 1m)
•Place both antennas with vertically alignment (polarisation)
•Antennas keep free of metal spacious
•Devices should not carry directly at the body
2.7 Note on operation of the modules
The interface parameters required for the system must be determined so that the data radio
functions with the user system. If applicable, these must be configured in the data radio
module. In the event of differing interface settings, no operation is possible or illegible
characters are transmitted. Two possibilities are offered for the configuration of the module via
RS232:
1. AT instruction set with a terminal program (chapter 3)
see also external document “Hyperterminal_HB” (short description)
2. “AMBER wireless Config Center” Windows-Tool ACC (chapter 4)
see also external document “ACC_HB”
In handling the module the ESD regulations must at all costs be observed to avoid
damage through static discharge!

AMB8350 Manual V1.2 Page 9 of 21 As of: 9.2.2007
3 Configuration with AT instructions
The data radio modem can be configured with a PC via the AT instruction set. The parameter
assignment occurs via RS232. A terminal program (e.g. Hyperterminal) allows communication
with the module. For this the correct interface parameters in the terminal program are a
precondition. The data format, the data rate and the handshake must be set as in the AMB8350
(on this see the external short description “Hyperterminal_HB”).
The AT commands will only be correctly understood if the setting is the same and only
then will a correct data transmission be possible.
For this reason we recommend making a note of the parameter settings every month. In
this way subsequent interface adjustment and correct communication with the modem
can be set up and carried out quickly.
3.1 Switch to the instruction level
The switch from the data mode to the instruction mode occurs via an escape sequence.
The ASCII character “+” (decimal 43) has been set as standard escape character. The escape
character can be set via the instruction “ATS5=x”.
Switch to the instruction mode:
1. 0.5 second waiting time before entry of the escape character
2. Enter the escape character 3x within 1 second
3. 0.5 second waiting time after entry of escape character
4. If the switch to the instruction mode was successful, the modem will report with “OK”
After the soft- or hardware reset the AMB8350 is once again in transmission mode.
Without reset the return to the transmission mode occurs via the instruction ‘ATO’.

AMB8350 Manual V1.2 Page 10 of 21 As of: 9.2.2007
3.2 AT instruction set
3.2.1 General
• The data radio device must be connected to a free COM port on the PC
• The instruction input occurs with the help of a terminal program e.g. Hyperterminal (see
short external description “Hyperterminal_HB”)
• On starting up the data radio module the terminal session must be configured with the
interface parameters 9,600bps, 8n1, without handshake (default)
• Instruction lines must always begin with AT (ATtention)
• The instruction input can occur in capitals or lower case letters
• The instruction input must be concluded with a CR (Return – except ESC sequence)
• On the instruction level a character echo is always returned to the RS232
Important:
Non-volatile storage of configuration settings in the module only occurs with the instruction
“AT&W” and as a rule only takes effect after a reset (power up or soft reset “atz”). In the case of
operating time parameters, it already takes effect before storage and reset (see respective notes).
3.2.2 AT instructions
Command Description Permissible values Example
Cx Set communication channel (0-40) ATC35
The setting of the communication channel occurs with this command.
Important: Before changing the channel please
consult chapter 2.5.3 “Channel frequency and use table”
Note:
•The setting will take effect at the next transition to radio operation (ato)
•The setting will be permanently stored only upon the instruction “AT&W”
Default setting: 35
Ix Issue product information (0-9) ATI2
Product-specific information can be identified with this command.
0: Product identification Product ID : AMB8350
1: Information on manufacturer Vendor ID : AMBER wireless GmbH Germany
2: Soft- and hardware release Software release: 1.1.0
3: Empty
4: Empty
5: Empty
6: Empty
7: Empty
8: Series number of transceiver Serial no. : 34
Product ID : 12
9: Date of software compilation Date of compilation: Oct 25 2006

AMB8350 Manual V1.2 Page 11 of 21 As of: 9.2.2007
Command Description Permissible values Example
Mx Set modem operation mode (1-5) ATM1
The radio modem can be set to 5 different modes. A detailed description of the modes
can be found in the appendix.
1: Data transmission addressed with acknowledge
2: Data transmission not addressed without acknowledge or CRC (broadcast)
3: Data transmission addressed without acknowledge with CRC
4: Data transmission addressed without acknowledge with CRC and ETX
5: Data transmission addressed with int acknowledge (for high RF data rate)
Default setting: 1
O Switch from command mode to online mode ATO
If the modem is in command mode after an escape sequence, it is possible to switch
back to the data mode with this instruction, e.g. after a temporary setting of the new
communication partner (at&cx).
Px Transmitting power of the module (1-90) ATP80
The transmitting power of the module can be set with this instruction
1: typical -10dBm (0.1mW)
5: typical 0dBm (1mW)
20: typical 5dBm (3mW)
50: typical 10dBm (10mW)
80: typical 13dBm (20mW)
90: typical 14dBm (max. 25mW)
Note:
•The setting takes effect upon the next transition to radio operation (ato)
•The setting is only permanently stored with the instruction “AT&W”
Default setting: 80 (typ. 20mW)
Z Software reset of modem ATZ
A software reset of the modem is carried out with this command, similar to switching the
modem on and off again.

AMB8350 Manual V1.2 Page 12 of 21 As of: 9.2.2007
3.2.3 AT-S Register
Command Description Permissible values Example
S1=x,x,x,x RS232 interface parameters (see below) ATS1=9600,8,n,1
Enter parameters in order “baud rate”,“databits,“parity”,“stop bits”
Permissible ranges:
Baud rate bps 1…115,200 (z. B. 110, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200)
Data bits 7 or 8
Parity e, n or o (even, no, odd)
Stop bits 1 or 2
The baud rate parameter can also be configured to interface speeds outside the usual
range for PCs (see examples above). If a non-standard bps value is entered and saved
in the module, RS232 access per PC is only possible using ACC.
Default setting: 9600,8,n,1
S2=x RS232 handshake (0-5) ATS2=0
Selecting the RS232 data flow control and special functions
0 no handshake (only recommended for short and small data packets)
1 no Handshake with collision detection
Level on ST1 Pin5 (RTS): LOW = Channel occupied; HIGH = channel free
2 no handshake (only recommended for short and small data packets)
3 Hardware handshake (RTS/CTS)
4 Software handshake (Xon/Xoff)
5 no handshake with RS232-Rx/Tx signalling (e.g. for RS485 converter)
Level on ST1 Pin5 (RTS): LOW=RS232-TxD HIGH=RS232-RxD
Default setting: 0
S3=x Tx Character delay (in characters) (1-255) ATS3=20
for operating modes 2-5 only
Max. number of characters sent to the RS232 before they are transmitted wirelessly.
(e.g.: 1 for immediate radio transmission of each single character)
Default setting: 20
S4=x Tx Time delay (in ms) (0-255) ATS4=5
for operating modes 2-5 only
Time after which characters are transmitted wirelessly (regardless of how many are
buffered).
Default setting: 5

AMB8350 Manual V1.2 Page 13 of 21 As of: 9.2.2007
Command Description Permissible values Example
S5=x ESC character (ASCII character) ATS5=+
Selection of characters for ESC sequence. Input as ASCII character, “+” = 43(dec) or
0x2b (no change usually necessary).
Any new Escape character should be documented to enable subsequent access from
the command level.
Default setting: +
S6=x RF bit rate (1-2) ATS6=1
Selection of RF bit rate and data encoding
1 10 kbps (Manchester)
2 57.6 kbps (NRZ; non return to zero)
RF bit rate 1:
The effective bit rate using Manchester encoding is half of the gross bit rate. This setting
results in a bit rate of 5 kbps. Depending on radio quality, data throughput of around 4-5
kbps can be expected.
RF bit rate 2 (for operating modes 2-5 only):
The effective bit rate using NRZ encoding equals the gross bit rate. This setting results
in a bit rate of 57.6 kbps. Depending on radio quality, data throughput of around 25-30
kbps can be expected. The channel/frequency table in section 2.3.4 applies. N.B.:
A frequency separation of 200 kHz must be maintained when choosing channels.
Operating mode 1 is not suitable for this bit rate. If not using your own transmission
protocol, set to operating mode 5 with Acknowledge. Operating modes 2 to 4 may be
used if the data packets for transmission are no larger than 200 bytes and the time
between these packets are not overly small. The RS232 hardware handshake is
recommended in all cases.
The high RF bandwidth reduces the receiver sensitivity of the 868 module. This in turn
reduces range by a factor of 2-4.
Default setting: 1
S7=x,x ETX character for ETX sequence (0-255) ATS7=13,10
for operating mode 4 only
Select the ETX character for operating mode 4 (a data packet is only sent wirelessly on
detection of an ETX sequence).
The default ETX sequence consists of the characters first byte dec 13 (0x0D = control
character CR) and second byte dec 10 (0x0A = control character LF). Enter decimal
values when choosing one or two new ETX characters.
Default setting: 13, 10

AMB8350 Manual V1.2 Page 14 of 21 As of: 9.2.2007
3.2.4 Extended AT commands
Command Description Permissible values Example
&Cx Comm. Partner (peer address) (0-255) AT&C1
Use this command to set the receiving Comm. partner (= destination address) for the
radio modem (no effect in operating mode 2).
Special function for operating mode 3:
If the special address 255 is used the module transmits to all other addresses
simultaneously.
Note:
•This setting takes effect the next time radio transmission is activated (ato)
•The setting is stored permanently with the AT&W command
Default setting: 1
&F Resetting the operating parameters to default values AT &F
Resets all operating parameters to factoring settings (default settings). Entering AT&W
saves these parameters to permanent memory.
&Nx Node number (local address of radio modem) (0-255) AT&N1
With this command the node number (= own address) of a radio modem can be set (no
effect in operating mode 2).
Special function for operating mode 3:
If the special address 255 is used the module receives all other addresses
simultaneously (monitoring function).
Note:
•This setting takes effect the next time radio transmission is activated (ato)
•The setting is stored permanently with the AT&W command
Default setting: 1

AMB8350 Manual V1.2 Page 15 of 21 As of: 9.2.2007
Command Description Permissible values Example
&V Display current operating parameters AT&V
This command displays the current operating parameters as follows:
at&v
Nodenumber : 1 at&n1
Comm. partner : 1 at&c1
Baud rate : 9600,8,n,1 ats1=9600,8,n,1
Flow control : disabled (0) ats2=0
Operating mode: Addressed & ACK (1) atm1
RF Frequency : 869.426 MHz
RF Channel : 35 atc35
RF DataRate : 5kbps Manchester (1) ats6=1
OK
&W Saving the current operating parameters AT&W
This command saves the operating parameters as configured to permanent memory,
which are loaded as such after a software or hardware reset.
&Z Display current extended operating parameters AT&Z
This command displays the current extended operating parameters as follows:
at&z
Freq. correct. : -58
PA gain : 80 atp80
Escape Char : + ats5=+
Char Delay : 20 ats3=20
Time Delay : 5 ats4=5
End Delimiter first Byte : 13 ats7=13,10 (0d)
End Delimiter second Byte : 10 ats7=13,10 (0a)
OK

AMB8350 Manual V1.2 Page 16 of 21 As of: 9.2.2007
4 Configuration with “AMBER wireless Config Center” (ACC)
The AMBER module can be configured per RS232 using the PC software ACC. The RxD, TxD
and GND lines are required. In contrast to parameterisation with AT commands in the terminal
program, the RS232 interface parameters for communicating with ACC, as configured in the
module, have no effect. Each module configuration can be correctly read out, displayed and
easily changed with the ACC. The external documentation “ACC_HB” describes how the
software tool works in detail regarding the following:
•ACC start and operation of AMBER with ACC
•Settings with ACC
•ACC category “General Settings”
•ACC category “UART Settings” (RS232)
•ACC category “Extended Settings”
•Completing configuration with ACC
•Saving settings with ACC
•Firmware update via RS232 with ACC

AMB8350 Manual V1.2 Page 17 of 21 As of: 9.2.2007
5 Description of radio modem modes
5.1 Operating mode 1, transmission addressed, secured with Acknowledge
Data is transmitted in packets and addressed. The packet is CRC checked and, if successful,
returns an Ack. Faulty packets are repeated. To begin with, a secure connection is made to the
selected peer. This mode is optimised for small RF bit rates and is not suitable for RF bit rate 2.
5.2 Operating mode 2, transparent transmission, without Acknowledge or CRC
In this operating mode the data received from the RS232 interface are split into packets and
transmitted transparently via the radio channel. There is no addressing, error detection or
correction, making this mode suitable for broadcast operation.
In addition to the actual data, only a preamble and information about packet length are
included.
5.3 Operating mode 3, transmission addressed, without Acknowledge, with CRC
In addition to the actual user data, information is transmitted to the recipient and sender of the
data packet. If the addressee does not match the address (node number) of the receiving
module, the message is rejected.
The receiving module does not return an acknowledge and faulty frames are lost.
If the receiving address is determined as 255, the incoming frame is interpreted and used as a
broadcast frame. In return, by configuring your own module with node number 255, frames can
also be received which are addressed to other stations (monitoring function).
A 16-bit checksum is additionally appended to the data. If an error is detected, the incoming
user data is not output to the RS232.
5.4 Operating mode 4 equals mode 3 with additional ETX sequence
This mode is intended for “Command & Response” applications, i.e. for half-duplex applications
involving the transmission of just one packet and receipt of an answer.
Mode 4 behaves in exactly the same way as mode 3 with the difference that a data packet is
first transmitted when an ETX sequence is detected. An ETX sequence may consist of one or
two bytes at the end of a data packet. The default ETX sequence consists of the two bytes
0x0D and 0x0A (CR and LF). If these characters are detected in the data flow, radio
transmission of the data packet is immediate. If, however, the Tx delay time has expired, it is
sent before the ETX sequence is found. In cases where this is not desirable, the “Tx Time delay
ms” selected must be large enough (see S-Register 4).
The S-Register 7 is used to change the ETX characters in the sequence.

AMB8350 Manual V1.2 Page 18 of 21 As of: 9.2.2007
5.5 Operating mode 5, transmission addressed, secured with Acknowledge 57.6
Data is transmitted in packets according to address as in mode 1. Mode 5 is optimised for data
transmission with a high RF bit rate of 57.6 kbps (see S-Register 6). For continuous data flows,
use of the RS232 hardware handshake RTS/CTS is essential to avoid a buffer overflow.
If the handshake is not available, your own transmission protocol must be used or the size of
data packets reduced to below 200 bytes and sent with adequate time between. Correct radio
transmission without handshake and protocol is not possible in a disturbed environment.
5.6 Handshake mode 1 collision detection
The command ats2=1 switches the module to collision detection mode, at&w saves it to hard
memory. The function is available after a hardware or software reset. As in HS mode 0 the
module’s data flow is not controlled.
Mode of operation:
If the recipient detects an extraneous data packet the module’s RTS line is set to low for 400
ms and switches to high again if no further data are received.
If a data connection link exists between two outside devices, data traffic is permanent and RTS
remains at low.

AMB8350 Manual V1.2 Page 19 of 21 As of: 9.2.2007
6 Delay times as a result of radio data transmission
Because of the nature of radio data transmission, a time delay (latency) occurs when
transmitting serial data results between two radio modules. Latency depends on the link type.
Image: above = senders’ RX line; below = recipient’s TX line
6.1 Internal data handling
The data received by the RS232 interface are transmitted from the module by radio only once
the following conditions have been met:
1. If more than 20 data bytes were received via the RS232 and/or data exist in the
module’s internal RS232 receive buffer (set with S-Register 3).
2. The data in the RS232 receive buffer are sent at the latest 5 ms following receipt
of the last data byte by radio (set with S-Register 4).
The internal receive and transmit buffer for data from and to the RS232 interface are both 300
bytes in size. If the RTS/CTS handshake is used, a stop indication is output if more than 280
bytes are in the buffer. Packet length can be variably adjusted depending on the quantity of
user data, to a maximum of 256 bytes.
Data flows transmitted to the RS232 can be sent in fragments by the radio module owing to the
division into radio data packets and output in fragments at the receiving RS232.

AMB8350 Manual V1.2 Page 20 of 21 As of: 9.2.2007
7 Statement of compliance
Approval tests in progress
The transceiver can be used throughout the EU