Ublox EVK-R6 User manual

UBX-21035387 - R03
C1-Public www.u-blox.com
EVK-R6 and EVK-L6
LARA-R6 and LARA-L6 series cellular evaluation kits
User guide
Abstract
This guide explains how to set up the u-blox EVK-R6 and EVK-L6 evaluation kits to begin evaluating
the LARA-R6 series cellular modules supporting LTE Cat 1 / 3G / 2G radio access technologies and
the LARA-L6 series cellular modules supporting LTE Cat 4 / 3G / 2G radio access technologies.

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Document information
Title
EVK-R6 and EVK-L6
Subtitle
LARA-R6 and LARA-L6 series cellular evaluation kits
Document type
User guide
Document number
UBX-21035387
Revision and date
R03
06-Dec-2022
Disclosure restriction
C1-Public
This document applies to the following products:
Product name
Type number
EVK-R6001
EVK-R6001-00B-00
EVK-R6401
EVK-R6401-00B-00
EVK-R6801
EVK-R6801-00B-00
EVK-L6004
EVK-L6004-00B-00
EVK-L6004D
EVK-L6004D-00B-00
u-blox or third parties may hold intellectual property rights in the products, names, logos and designs included in this
document. Copying, reproduction, modification or disclosure to third parties of this document or any part thereof is only
permitted with the express written permission of u-blox.
The information contained herein is provided “as is” and u-blox assumes no liability for its use. No warranty, either express or
implied, is given, including but not limited to, with respect to the accuracy, correctness, reliability and fitness for a particular
purpose of the information. This document may be revised by u-blox at any time without notice. For the most recent
documents, visit www.u-blox.com.
Copyright © u-blox AG.

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Contents
Document information................................................................................................................................2
Contents ..........................................................................................................................................................3
1Starting up...............................................................................................................................................4
1.1 EVK-R6 and EVK-L6 overview .................................................................................................................. 4
1.2 EVK-R6 and EVK-L6 block diagram and basic description ................................................................5
1.3 Switches, jumpers and buttons ...............................................................................................................6
1.4 LEDs...............................................................................................................................................................6
1.5 Connectors ...................................................................................................................................................7
1.6 EVK-R6 and EVK-L6 pin out .....................................................................................................................8
1.7 Software installation..................................................................................................................................9
1.8 Board setup ................................................................................................................................................10
1.9 Enabling error result codes .....................................................................................................................12
1.10 PIN code insertion (when required)........................................................................................................12
1.11 Registration on a cellular network.........................................................................................................12
1.12 Switching off the EVK-R6 and EVK-L6.................................................................................................12
Appendix ....................................................................................................................................................... 13
ASetting up AT terminal applications for communication with EVK-R6 and EVK-L6 ... 13
BSetting up cellular packet data connection............................................................................... 14
B.1 Install and configure a low data rate modem connection on Windows .........................................14
B.2 Install and configure a high data rate modem connection on Windows .......................................16
B.3 Setting up cellular packet data connection on Linux ........................................................................18
CExamples of AT commands............................................................................................................. 22
C.1 Define the initial default bearer for connectivity................................................................................22
C.2 Data connection using internal TCP/IP stack .....................................................................................22
C.3 Opening a TCP socket ..............................................................................................................................23
C.4 Opening a UDP socket..............................................................................................................................23
C.5 Configure audio interface for earphones .............................................................................................24
DCurrent consumption measurement............................................................................................ 25
EGlossary ................................................................................................................................................. 26
FDeclaration of conformities............................................................................................................. 26
Related documentation ........................................................................................................................... 27
Revision history.......................................................................................................................................... 27
Contact.......................................................................................................................................................... 27

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1Starting up
1.1 EVK-R6 and EVK-L6 overview
The u-blox EVK-R6 and EVK-L6 kits are powerful and easy-to-use tools that simplifies the evaluation
of the LARA-R6 series multimode LTE Cat 1 / 3G / 2G cellular modules and the evaluation of the
LARA-L6 series multimode LTE Cat 4 / 3G / 2G cellular modules.
The following evaluation kits are available (see Figure 1):
•EVK-R6001 evaluation kit is for evaluation of LARA-R6001 modules
•EVK-R6401 evaluation kit is for evaluation of LARA-R6401 modules
•EVK-R6801 evaluation kit is for evaluation of LARA-R6801 modules
•EVK-L6004 evaluation kit is for evaluation of LARA-L6004 modules
•EVK-L6004D evaluation kit is for evaluation of LARA-L6004D modules
All the EVK-R6001, EVK-R6401, EVK-R6801, EVK-L6004 and EVK-L6004D evaluation kits are herein
identified as EVK-R6 and EVK-L6.
☞See the LARA-R6 series data sheet [2], the LARA-L6 series data sheet [3], and the LARA-R6 /
LARA-L6 series system integration manual [4] for the features supported by the u-blox LARA-R6
and LARA-L6 series cellular modules.
SIM card
holder
J300
Cellular reset
SW303
Cellular power-on
SW302
GND
9 –18 V
Power input
J400
Cellular
adapter board
DL400
Main
power switch
SW400
DL401
Secondary cellular
antenna connector
ANT DIV - J106
LARA-R6
Cellular module
DIL B2B
connector
J103
DIL B2B connector
J104
GND
GNSS
antenna connector
J103
GNSS module
GNSS
adapter board
Cellular VCC
supply jumper
J404
Cellular USB
(UART)
J501
Cellular RS232
(UART)
J500
DL501
DL403
DL405
GNSS USB
J102
SW403
SW401
DL404
SW300
SW304
SW204
Headset jack
J303
DS124
DS107
DS105
DS109
DS103
DS500
GND
GND
Primary cellular
antenna connector
ANT - J202
Cellular native
USB J105
DS100
3-pin header
J248
Cellular USB
(two UARTs)
J201
SW510
DS501
Cellular VCC
Jumper
J109
DS124
DS121
DS121
DS201
Figure 1: Overview of EVK-R6 and EVK-L6 evaluation kit for LARA-R6 and LARA-L6 modules

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1.2 EVK-R6 and EVK-L6 block diagram and basic description
Figure 2 shows the main interfaces and internal connections of EVK-R6 and EVK-L6 evaluation kits:
SIM
card holder
(J300)
Reset
(SW303)
Power-on
(SW302)
LARA-R6/L6
adapter board
(ADP-R6/L6)
LARA-R6/L6
Cellular
module
42-pin DIL B2B connector (J104)
42-pin DIL B2B connector (103)
EVB-WL3
GNSS
module
GNSS adapter board
RF
USB
UART
converter
Cellular USB
(Main UART)
(J501)
Cellular RS232
(Main UART)
(J500)
RS232
UART
converter UART
MiniUSB/DB9
switch
(SW403)
On-Board/B2B
switch
(SW401)
USB
Headset jack
(J303)
I2C
Step - Down
Main power switch
(SW400)
12 V
(J400)
3.8 V
VCC jumper
(J404)
LDO
GPIO2/3/4
GNSS switch
(SW304) Native
USB
(J105)
ANT
(J106)
ANT DIV
(J202)
Audio
Codec
Cellular USB
(two UARTs)
(J201)
USB/UART
converter
UARTs
(J248)
VCC jumper
(J109)
Figure 2: Block diagram of EVK-R6 and EVK-L6 for LARA-R6 and LARA-L6 modules
The EVK-R6 and EVK-L6 is formed by three boards:
•The lower one, called EVB-WL3 or simply EVB, contains the power supply and other peripherals for
the cellular module (such as SIM card holder, reset button and power-on button).
•The cellular adapter board, called ADP-R6 / ADP-L6, contains the LARA-R6 / LARA-L6 cellular
module, the cellular antenna connectors (ANT / ANT DIV), the USB “native”connector (J105), the
USB “two UARTs”connector (J201), the UARTs routing switch (J248), the VCC jumper (J109) and
an audio codec.
•The GNSS adapter board, called ADP-GNSS, contains the u-blox GNSS module, the GNSS antenna
connector and the USB connector for the GNSS module.
The cellular and the GNSS adapter boards (ADP-R6/L6 and ADP-GNSS respectively) are connected by
means of male header board-to-board connectors provided on the bottom of the adapter boards and
their corresponding female connectors provided on top of the lower board (EVB-WL3).
The USB interface of the cellular module is available on the native USB connector (J105) on the cellular
adapter board (ADP-R6 / ADP-L6).
The main UART and the auxiliary UART interfaces of the cellular module can be routed as follows, by
means of the 3-way UARTs’routing switch (J248) available on the cellular adapter board (ADP-R6 /
ADP-L6) as illustrated in Figure 3:
•EVB position (pin 1-2 of J248 shorted by jumper socket): main UART routed as 8-wire interface to
the lower EVB-WL3 board by the means of dual-in-line male board-to-board connectors mounted
on the bottom of the adapter board ADP-R6/L6. According to the mini-USB / DB9 switch (SW403)
setting on the EVB-WL3, the main 8-wire UART interface can be accessed on the USB connector
(J501) or on the RS232 DB9 connector (J500) on the EVB-WL3, with the on-board / B2B switch
(SW401) on the EVB-WL3 set to “on-board”. The auxiliary UART interface is not available.
•ADP position (pin 2-3 of J248 shorted by jumper socket): main UART and auxiliary UART routed
as 4-wire interfaces to the USB two UARTs connector (J201) mounted on the adapter board, with
the on-board / B2B switch (SW401) on the EVB-WL3 board is set to “B2B”.
•No position (no jumper socket on J248): main 8-wire UART interface or main 4-wire UART with
auxiliary 4-wire UART interfaces, routed to the dual-in-line male header connectors mounted on
the top of the adapter board ADP-R6/L6, allowing a connection to an external compatible device
with the on-board / B2B switch (SW401) on the EVB-WL3 board set to “B2B”.

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J248
Pin 1
J248
Pin 3
J107
Pin 1
Figure 3: 3-pin header J248 available to set the routing of the UART interfaces on the EVK for LARA-R6 / LARA-L6 modules
The other peripherals of the cellular module are available on the dual-in-line male header connectors
(J103 / J104) provided on the top layer of the cellular adapter board ADP-R6 / ADP-L6.
The lower board is designed to also be used with other u-blox cellular adapter boards. It contains
additional switches, jumpers, connectors, LEDs and parts that are partially described in Figure 1 or in
this document, because they are intended for use only with other u-blox cellular modules. It is
recommended to leave any additional connector unconnected, and to leave any additional switch in
its default configuration.
1.3 Switches, jumpers and buttons
Function
Description
Name
Board
Main power switch
Power on / off the whole evaluation kit
SW400
EVB
Cellular VCC
Jumper socket to provide the 3.8 V supply to the cellular module VCC input
J404
EVB
Cellular power-on
Push button to switch-on the cellular module
SW302
EVB
Cellular reset
Push button to reset the cellular module
SW303
EVB
Cellular UART detach
Slide switch to attach / detach cellular module UART from USB / RS232 connectors:
when detached, UART signals available only on DIL B2B connector on ADP board
SW401
EVB
Cellular UART routing
Slide switch to select cellular module main UART routing on USB or on RS232
connector
SW403
EVB
Cellular GPIO detach
Slide switch to attach / detach the cellular module GPIOs from peripherals: when
detached, the signals are available only on the DIL B2B connector on ADP-R6/L6
SW300
EVB
Cellular GNSS detach
Slide switch to attach / detach the cellular module to the GNSS module (GPIO2-3-4):
when detached, signals are available only on DIL B2B connector on ADP-R6/L6
SW304
EVB
GNSS V_BCKP
Slide switch to connect / disconnect backup battery to V_BCKP pin of the GNSS
module
SW204
EVB
Cellular VCC
Jumper socket to provide the 3.8 V supply to the cellular module VCC input
J109
ADP-R6
ADP-L6
Cellular UARTs routing
Jumper to route cellular module UART interfaces to USB two UARTs connector
(both Main and Auxiliary UART) or to lower board by the means of Dual-In-Line
male Board-to-Board connectors (only Main UART)
J248
ADP-R6
ADP-L6
Table 1: EVK-R6 and EVK-L6 switch and button descriptions
1.4 LEDs
Function
Description
LED #
Board
Color
Main power
Power supply plugged in the 9 - 18 V Power Input
DL401
EVB
Cellular VCC
Cellular module supplied. Main power switch must be switched on
DL400
EVB
Cellular native USB
USB cable plugged in the Cellular native USB connector
DS100
ADP-R6/L6
Cellular two UARTs USB
USB cable plugged in the Cellular two UARTs USB connector
DS201
ADP-R6/L6
Cellular USB
USB cable plugged in the Cellular USB connector for UART access
DL501
EVB

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Function
Description
LED #
Board
Color
Cellular USB / UART
Green light is activated when UART is routed to the cellular USB connector
Red light blinks at UART TX or RX data on the Cellular USB connector
DL403
EVB
Cellular UART detach
UART signals are available only on the DIL connector on ADP-R6/L6 board
DL404
EVB
Cellular RS232 / UART
Green light is activated when UART is routed to Cellular RS232 connector
Red light blinks at UART TX or RX data on the Cellular RS232 connector
DL405
EVB
Cellular RI indicator
RI line turns ON (active low)
DS501
EVB
Cellular CTS indicator
CTS line turns ON (active low)
DS500
EVB
Cellular GPIO1 indicator
Green light is activated when cellular GPIO1 is high
DS107
EVB
Cellular GPIO2 indicator
Green light is activated when cellular GPIO2 is high
DS105
EVB
Cellular GPIO3 indicator
Green light is activated when cellular GPIO3 is high
DS109
EVB
Cellular GPIO4 indicator
Green light is activated when cellular GPIO4 is high
DS103
EVB
GNSS VCC supply
GNSS module supply is turned ON
DS118
ADP-GNSS
GNSS USB
USB cable plugged in GNSS USB connector
DS124
ADP-GNSS
GNSS time pulse
Pulses at 1 Hz when valid GNSS fix
DS121
ADP-GNSS
Cellular / GNSS I2C
Cellular / GNSS module communication over the I2C interface
DS132
ADP-GNSS
Table 2: EVK-R6 and EVK-L6 LED descriptions
1.5 Connectors
Function
Description
Name
Board
9 - 18 V Power Input
Connector for the AC / DC power adapter of the EVK
AC: 100-240 V, 0.8 A, 50-60 Hz / DC: +12 V, 2.5 A
IEC 60417-5172
Class II equipment
J400
EVB
SIM card holder
SIM card holder
J300
EVB
Primary cellular
antenna
SMA connector for the cellular module primary antenna (ANT1, Tx/Rx)
J106
ADP-R6/L6
Secondary cellular
antenna
SMA connector for the cellular module secondary antenna (ANT2, Rx)
J202
ADP-R6/L6
Cellular native USB
Mini USB connector for the cellular module native USB interface
J105
ADP-R6/L6
Cellular two UARTs
USB
Mini USB connector for the cellular module main and auxiliary USB interfaces
J201
ADP-R6/L6
Cellular USB (UART)
Mini USB connector for the cellular module UART interface converted as USB
interface
J501
EVB
Cellular RS232
(UART)
DB9 connector for the cellular module UART interface converted as RS232
interface
J500
EVB
DIL B2B headers
Dual-In-Line Board-to-Board connectors for cellular module interfaces
J103-J104
ADP-R6/L6
Cellular headset
Audio headset jack connector for the cellular module audio interface
J303
EVB
GNSS antenna
SMA connector for the GNSS module antenna (GNSS antenna)
J208
ADP-GNSS
GNSS USB
Mini USB connector for the GNSS module USB interface
J102
ADP-GNSS
GNSS backup
battery
Backup battery socket for the GNSS module (under GNSS adapter board)
BT200
EVB
GND
Ground terminals for the probe reference
J402, J403
J405, J406
EVB
Table 3: EVK-R6 and EVK-L6 connector descriptions
⚠Caution! In the unlikely event of a failure in the internal protection circuitry, there is a risk of an
explosion when charging a fully or partially discharged battery. Replace the battery when it no
longer has a sufficient charge for unit operation. Control the battery before use if the device has
not been used for an extended period of time.
⚠Caution! Risk of explosion if battery is replaced with an incorrect type. Dispose of used batteries
according to the instructions!

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1.6 EVK-R6 and EVK-L6 pin out
LARA-R6/L6 series
DIL B2B
LARA-R6/L6 series
DIL B2B
LARA-R6/L6 series
DIL B2B
Pin N°
Name
Name / Pin N°
Pin N°
Name
Name / Pin N°
Pin N°
Name
Name / Pin N°
1
GND
J104 pins 7-10
24
GPIO3
J104 pin 31
47
RSVD
Not present
2
RSVD
Not present
25
GPIO4
J104 pin 26
48
RSVD
Not present
3
GND
J104 pins 7-10
26
SDA
J103 pin 22
49
RSVD
Not present
4
V_INT
J104 pin 35
27
SCL
J103 pin 19
50
GND
J104 pins 7-10
5
GND
J104 pins 7-10
28
USB_D-
Not present
51
VCC
J103 pins 8-10
6
DSR
J104 pin 17
29
USB_D+
Not present
52
VCC
J103 pins 8-10
7
RI
J104 pin 18
30
GND
J104 pins 7-10
53
VCC
J103 pins 8-10
8
DCD
J104 pin 12
31
RSVD
Not present
54
GND
J104 pins 7-10
9
DTR
J104 pin 11
32
GND
J104 pins 7-10
55
GND
J104 pins 7-10
10
RTS
J104 pin 14
33
RSVD
Not present
56
ANT1
Not present
11
CTS
J104 pin 13
34
I2S_WA
Not present
57
GND
J104 pins 7-10
12
TXD
J104 pin 16
35
I2S_TXD
Not present
58
GND
J104 pins 7-10
13
RXD
J104 pin 15
36
I2S_CLK
Not present
59
ANT_DET
Not present
14
GND
J104 pins 7-10
37
I2S_RXD
Not present
60
GND
J104 pins 7-10
15
PWR_ON
J104 pin 30
38
SIM_CLK
J103 pin 16
61
GND
J104 pins 7-10
16
GPIO1
J104 pin 34
39
SIM_IO
J103 pin 13
62
ANT2
Not present
17
VUSB_DET
Not present
40
SIM_RST
J103 pin 15
63
GND
J104 pins 7-10
18
RESET_N
J103 pin 25
41
VSIM
J103 pin 14
64
GND
J104 pins 7-10
19
GPIO6
J104 pin 23
42
GPIO5
J104 pin 24
65-96
GND
J104 pins 7-10
20
GND
J104 pins 7-10
43
GND
J104 pins 7-10
97
RFCTRL11
J103 pin 5
21
GND
J104 pins 7-10
44
RSVD
Not present
98
RFCTRL2 1
J103 pin 6
22
GND
J104 pins 7-10
45
RSVD
Not present
99
RSVD
Not present
23
GPIO2
J104 pin 32
46
RSVD
Not present
100
RSVD
Not present
Table 4: Interfaces of LARA-R6/L6 modules, as routed on the 42-pin dual-in-line board-to-board connectors (J103, J104)
available on the adapter board ADP-R6/L6 of the EVK-R6 and EVK-L6 evaluation kits
1
LARA-R6401 and LARA-R6401D only. Pin reserved for future use (RSVD) otherwise.

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Dual-in-line board-to-board connector J104
Dual-in-line board-to-board connector J103
Signal name
Pin N°
Pin N°
Signal name
Signal name
Pin N°
Pin N°
Signal name
Not connected
1
2
GND
Not connected
1
2
GND
Not connected
3
4
Not connected
Not connected
3
4
Not connected
Not connected
5
6
Not connected
RFCTRL12
5
6
RFCTRL22
GND
7
8
GND
Not connected
7
8
VCC
GND
9
10
GND
VCC
9
10
VCC
DTR
11
12
DCD
Not connected
11
12
Not connected
CTS
13
14
RTS
SIM_IO
13
14
VSIM
RXD
15
16
TXD
SIM_RST
15
16
SIM_CLK
DSR
17
18
RI
Not connected
17
18
Not connected
Not connected
19
20
Not connected
SCL
19
20
Not connected
Not connected
21
22
Not connected
Not connected
21
22
SDA
GPIO6
23
24
GPIO5
Not connected
23
24
Not connected
Not connected
25
26
GPIO4
RESET_N
25
26
Not connected
Not connected
27
28
Not connected
Not connected
27
28
Not connected
Not connected
29
30
PWR_ON
Not connected
29
30
Not connected
GPIO3
31
32
GPIO2
Not connected
31
32
Not connected
Not connected
33
34
GPIO1
Not connected
33
34
Not connected
V_INT
35
36
Not connected
Not connected
35
36
Not connected
Not connected
37
38
Not connected
Not connected
37
38
Not connected
Not connected
39
40
Not connected
Not connected
39
40
Not connected
GND
41
42
Not connected
GND
41
42
Not connected
Table 5: Pin-out of the 42-pin dual-in-line board-to-board connectors (J103, J104) available on the adapter board ADP-R6/L6
of the EVK-R6 and EVK-L6 evaluation kits for LARA-R6/L6 series modules
☞The pins / interfaces that are not supported by a specific LARA-R6 / LARA-L6 product version
should not be driven by an external device (see the LARA-R6 series data sheet [2], the LARA-L6
series data sheet [3] and the LARA-R6 / LARA-L6 series system integration manual [4] for the
features supported by each LARA-R6 / LARA-L6 product version).
1.7 Software installation
The LARA-R6 and LARA-L6 USB drivers for Windows OS are available with the EVK-R6 and EVK-L6.
Download the executable file from https://www.u-blox.com/en/product/evk-r6 and save it to any
location on the computer. Start the installation by running the executable.
2
LARA-R6401 and LARA-R6401D only. Pin reserved for future use (RSVD) otherwise.

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1.8 Board setup
1. Insert a SIM card into the SIM card holder (J300 on the EVB).
2. Connect a cellular antenna provided with the EVK-R6 and EVK-L6 evaluation kit box to the
Primary cellular antenna SMA connector on the ADP-R6 / ADP-L6 (ANT, RF input/output for
transmission and reception of LTE/3G/2G RF signals)
3. Connect a cellular antenna provided with the EVK-R6 and EVK-L6 evaluation kit box to the
Secondary cellular antenna SMA connector on the ADP-R6 / ADP-L6 (ANT DIV, RF input for the
reception of the LTE / 3G RF signals as per Down-Link Rx diversity and/or MIMO 2x2). Place the
secondary cellular antenna far enough from the primary cellular antenna (more than 20 cm).
4. If the GNSS functionality is required, connect the GNSS antenna provided with the evaluation kit
to the GNSS antenna SMA connector on the ADP-GNSS. Keep the cellular GNSS detach switch
(SW304) in “GNSS” position. Place the GNSS antenna in a location with a good view of the sky.
5. Connect the AC / DC +12 V power adapter provided with the evaluation kit box to the 9 –18 V
Power Input connector (J400 on the EVB). LED DL401 lights blue.
6. Be sure to provide a jumper socket on the Cellular VCC supply jumper (J404 on the EVB) and to
Cellular VCC supply jumper (J109 on the ADP-R6 / ADP-L6). These provide the connection from
the 3.8 V output of the supply circuit from the EVB to the VCC input of the cellular module.
7. To enable the board power supply, turn the Main power switch (SW400 on the EVB) to the ON
position. LED DL400 lights green. The cellular module is powered but still switched off.
8. For communication via the cellular module’s USB interface, connect a USB cable to the Cellular
native USB (J105) connector (on ADP-R6 / ADP-L6). LED DS100 on ADP-R6 / ADP-L6 lights blue.
Once the switch-on of the cellular module is triggered (see point 11), the COM ports listed in the
Table 6 are enabled by the Windows USB driver after the end of the module boot (details as the
numbering of the ports can be seen via the Windows Device Manager)
3
:
Parameter
Type
Remarks
u-blox Modem USB1 AT and Data
Modems
AT command interface and data communication
u-blox Modem USB2 AT and Data
Modems
AT command interface and data communication
u-blox Modem USB3 AT and Data
Modems
AT command interface and data communication
u-blox Modem USB0 Diagnostics Log
Ports (COM & LPT)
Diagnostic purpose
Table 6: Cellular USB interface configuration
Run an AT terminal application (such as u-blox m-center), selecting an AT port with these
settings:
oData rate: 115,200 bit/s
oData bits: 8
oParity: N
oStop bits: 1
oFlow control: HW
See appendix Afor how to configure the u-blox m-center AT terminal for Windows.
3
A message of “driver installation fail” may appear on Windows if the USB cable has been connected before the end of the
module boot, but this can be ignored as the normal operating functionality of the module will be available anyway after the end
of the module boot.

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9. For communication via the cellular module’s UART interfaces, the following connections are
allowed and can be alternatively enabled in a mutually exclusive way (see Table 7 for the switch
position and LED status, and see Figure 1 and Figure 3 for the location of the related connectors,
slide switches and the 3-way UARTs’routing switch J248):
a. Connect a USB cable to the mini-USB connector (Cellular USB Main UART, J501 on EVB).
The LED DL501 lights blue. When a USB cable is connected to this mini-USB connector, two
COM ports are enabled in Windows. The main 8-wire UART interface of the cellular module is
available over the first COM port opened by the driver after the end of the module boot, once
the switch-on of the cellular module is triggered (see point 11).
b. Connect an RS232 cable to the DB9 connector (Cellular RS232 Main UART, J500 on EVB):
the main 8-wire UART interface of the cellular module is available over RS232 after the end
of the module boot, once the switch-on of the cellular module is triggered (see point 11).
c. Connect a USB cable to the mini-USB connector (Cellular USB two UARTs, J201 on ADP-R6
/ ADP-L6). The LED DS201 lights blue. The two 4-wire UART interfaces of the cellular module
are respectively available over the two numbered COM ports opened by the driver after the
end of the module boot, once the switch-on of the module is triggered (see point 11). (To
enable two UART interfaces, see the AT commands manual [1], the +USIO AT command.)
Type of connections
SW401
SW403
J248
LED
Access to the main UART interface over the Cellular USB
(Main UART) mini-USB connector on EVB-WL3 (J501)
ON BOARD
MINIUSB
Jumper socket
on pins 1-2
DL403
DL501
Access to the main UART interface over the Cellular RS232
(Main UART) DB9 connector on EVB-WL3 (J500)
ON BOARD
DB9
Jumper socket
on pins 1-2
DL405
Access to the two UART interfaces over the Cellular USB
(Two UARTs) mini-USB connector on ADP-R6/L6 (J201)
B2B
Do not care
Jumper socket
on pins 2-3
DL404
DS201
Access to UART(s) interface(s) over the DIL B2B header on
the top of the adapter board (J104)
B2B
Do not care
No jumper socket
DL404
Table 7: UART serial interfaces configuration
Run an AT terminal application (e.g., the u-blox m-center tool) selecting an AT port, with these
settings:
▪Data rate: 115,200 bit/s
▪Data bits: 8
▪Parity: N
▪Stop bits: 1
▪Flow control: HW
See appendix Afor how to configure the u-blox m-center AT terminal for Windows.
10. If the audio functionality is required, connect the headset provided with the evaluation kit box to
the Headset jack connector (J303 on EVB).
11. Press the Cellular power-on button (SW302 on the EVB) to switch on the cellular module
mounted on the APD-R6.

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1.9 Enabling error result codes
Command sent by DTE (user)
DCE response (module)
Description
AT+CMEE=2
OK
Enables the cellular module to report verbose error
result codes.
1.10 PIN code insertion (when required)
Command sent by DTE (user)
DCE response (module)
Description
AT+CPIN="8180"
OK
Enter the PIN code, if needed (enter the PIN of the SIM
card –8180 is written here as an example).
AT+CLCK="SC",0,"8180"
OK
Unlock the PIN at power-on (the last parameter is the
PIN of the SIM card –8180 is written here as an
example).
AT+CLCK="SC",1,"8180"
OK
Lock the PIN at power-on (the last parameter is the PIN
of the SIM card –8180 is written here as an example).
1.11 Registration on a cellular network
Command sent by DTE (user)
DCE response (module)
Description
AT+CREG?
+CREG: 0,1
OK
Verify the network registration.
AT+COPS=0
OK
Register the module on the network.
The cellular module automatically registers itself on
the cellular network. This command is necessary only if
the automatic registration failed (AT+CREG? returns
0,0).
AT+COPS?
+COPS: 0,0,"I TIM",7
OK
Read the operator name and radio access technology
(RAT).
See appendix Cfor further AT command examples describing how to define the initial default bearer
for connectivity, how to set up a data connection using internal TCP/IP stack, how to open a TCP
socket, or how to open a UDP socket.
1.12 Switching off the EVK-R6 and EVK-L6
To switch off the cellular module in the EVK-R6 and EVK-L6, send the +CPWROFF AT command.
Make sure to use this command before switching off the main power, otherwise settings and
configuration parameters may not be saved in the internal non-volatile memory of the cellular module.

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Appendix
ASetting up AT terminal applications for
communication with EVK-R6 and EVK-L6
The u-blox m-center tool is a powerful platform for evaluating, configuring and testing u-blox cellular
products. m-center includes an AT commands terminal for communication with the device and can
be downloaded free-of-charge from our website (https://www.u-blox.com/en/product/m-center).
1. Follow the board setup instructions in section 1.8 to provide all the required connections and
switching on the cellular module.
2. Run the m-center tool: after the m-center start-up, the Home page appears.
3. On the Home page, set up the AT COM port;
for the setting values see section 1.8.
Check with the Windows Device Manager to
find out which COM port is being used by the
EVK-R6 and EVK-L6.
Figure 4: “Home” page
4. Enable the connection to u-blox cellular
module by clicking on the Connect button.
5. Retrieve the module and network information
by clicking on the Get Info button.
6. The module information is retrieved and
displayed on the Home page.
7. Click on the AT Terminal button, found at the
upper right of the Home page. A new window
opens and the AT-command terminal is now
ready for communication with the EVK-R6
and EVK-L6.
Figure 5: AT Terminal window
8. The AT terminal is ready to use.
For the complete list of AT commands
supported by the modules and their syntax,
see the u-blox AT commands manual [1].
For more information on using the u-blox m-center cellular module evaluation tool, press the F1 key
on the keyboard to open the m-center help window on the computer.

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BSetting up cellular packet data connection
☞To set up high data rate connection on EVK-L6, see LARA-L6 series Linux integration guide [5].
This section describes how to set up a packet data connection on Windows 10 and Linux using the
operating system’s TCP/IP stack and EVK-R6 and EVK-L6. This is also referred to as a dial-up
connection (PPP), which is not ideal in the throughput performance perspective but it may be good
enough for many applications that do not require high data rate connection.
The following examples describe how to install and configure two different kinds of modems on
Windows:
1. Low data rate modem: via the UART interface of the cellular module connected to the Windows
PC by the Cellular USB connector (J501 on EVB) or the Cellular RS232 connector (J500 on EVB)
2. Higher data rate modem: via the native USB interface of the cellular module connected to the
Windows PC by the Cellular Native USB connector (J105 on the ADP-R6 / ADP-L6)
3. Higher data rate modem: via the native USB interface of the cellular module connected to Linux
Ubuntu 22.04 by the Cellular Native USB connector (J105 on the ADP-R6 / ADP-L6)
B.1 Install and configure a low data rate modem connection on
Windows
This example describes how to install and configure a low data rate packet data connection on a PC
with the Windows 10 operating system. This uses the TCP/IP stack of the PC over the UART interface
of the cellular module connected to the Windows PC by the Cellular USB connector (J501 on EVB) or
the Cellular RS232 connector (J500 on EVB).
1. From Control Panel, select Phone and
Modem > Modems > Add.
This opens the Add Hardware Wizard.

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2. Tick “Don’t detect my modem” checkbox.
Then click Next.
3. Select Standard 33600 bps Modem and
click Next.
4. Select the COM port to use for data
communication and click Next. This is the
COM port on which the modem will be
installed.
5. In the next step, click Finish to complete
the modem installation.

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6. Now the new modem is visible in Control
Panel, under Phone and Modem > Modems.
Any extra initialization AT command (e.g.,
to set a specific APN name) can be entered
by selecting Properties and filling in
Advanced > Extra initialization commands
text box.
Now the module is ready, and the connection can be configured.
The modem configuration can also be edited in Device Manager, by clicking on the modem name.
B.2 Install and configure a high data rate modem connection on
Windows
This example describes how to install and configure a high data rate packet data connection on a PC
with the Windows 10 operating system, using the TCP/IP stack of the PC, over the native USB
interface of the cellular module connected to the Windows PC by the Cellular Native USB connector
(J105 on the ADP-R6 / ADP-L6).
1. From Control Panel, select Network and
Sharing Center > Set up a new connection
or network”.
2. Click Connect to the Internet and then
Next.

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3. Select Dial-up and, if requested, the
modem previously installed.
4. Select one of the two AT commands
ports.
5. Enter the parameters for the dial-up
connection:
oThe module telephone number:
*99***1#
(change if using a PDP context
different from 1)
oThe specific account information for
the network operator
oA name for the connection (e.g., “R6
Dial-up”)
The packet data connection is now ready to be used with EVK-R6 and EVK-L6. Click “Connect” to start
the connection, then start a browser to check internet connectivity.
Consult the cellular network operator for username and password. In most cases, they can be left
empty.

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B.3 Setting up cellular packet data connection on Linux
This section describes how to set up a packet data connection on Linux (reference OS: Ubuntu 22.04)
on a PC connected with EVK-R6 and EVK-L6 over the USB interface of the modules. Follow the board
setup instructions described in section 1.8 to provide communication via the USB interface of the
modules. Use minicom or similar program to send AT commands via USB.
1. LARA-R6 and LARA-L6 use a non-standard USB specific class (Vendor Specific USB class). To
enumerate correctly on Linux hosts, use option driver:
/lib/modules/<kernel_version>/kernel/drivers/usb/serial/option.c.
To check if the module is correctly enumerated, for LARA-R6 use lsusb -t -d 05c6:908b; for
LARA-L6 in default mode, use lsusb -t -d 1546:1341.
2. Identify the ttyUSB* ports by ls /dev/ttyUSB* and then launch minicom to use this port. LARA-
R6 enumerates the port as ttyUSB0: diagnostic, ttyUSB1/ttyUSB2: AT interface, ttyUSB3: GNSS
tunneling/AT interface varying on the +USIO configuration. In the example below, ttyUSB1 is
used.

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3. In AT terminal, enter the following AT commands to set the PDP_type and the APN.
Command sent by DTE (user)
DCE response (module)
Description
AT+CFUN=4
OK
Set the module in airplane mode. The module will
deregister from the network and both RF Tx and RF Rx
will be disabled.
AT+CGDCONT=1,"IP","ibox.tim
.it"
OK
Define a PDP context with preferred APN: in this
example, the “ibox.tim.it” APN is selected.
AT+CFUN=1
OK
Set the module to full functionality. The module starts
the automatic network registration.
AT+CPIN?
+CPIN: READY
OK
Check the SIM PIN status and act accordingly.
AT+COPS?
+COPS: 0,0,"I TIM",7
OK
Check the +COPS <AcT> parameter to see if the
module is registered to the network.

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4. Use pppd in Linux as PPP daemon. The following configuration scripts can be used to start a PPP
connection through the module.