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GEM-10 GPRS/Modbus Gateway
User Manual
Rev 1.04
05/2012
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1.Introduction
1.1 General Features
ENTES GEM-10 GPRS/Modbus Gateway allows you to connect to your devices which communicate
using Modbus protocol via GPRS or Ethernet network. With GEM-10, you can use just one of the GPRS
or Ethernet connection options or you can use one of them as backup connection for the other one.
General features of GEM-10 are listed below.
● Cinterion MC55i Quad-band GPRS modem
● 10/100 Mbps Ethernet port
● RS485 port (300...115200 bps)
● Mini-USB port for configuration
● Ability to work with SIM cards which have static or dynamic IP
● Ability to set the device parameters via WEB (only available via ethernet)
● Ability to work in server or client mode
● Ability to work in ModbusTCP and Tunnel mode
Technical Data:
Table 1. GEM-10 Technical Data
Category Description
Network Protocols TCP/IP, ARP, ICMP,HTTP, ModbusTCP
Serial Ports RS485 for communication, USB port for configuration
Operating Modes ModbusTCP/RTU and Modbus Tunnel
Network Interface 10/100 Mbps auto-negotiation
Serial
Communication
Formats
Data Bits: 5-6-7-8 data bit
Stop Bit: 1-1.5-2 characters
Parity: Odd-Even-None
Serial Interface 300-115200 bps
Power Supply 12-20V DC
Isolation and Protection
RS485 port: 500V
Ethernet port: 1500V
15KV ESD protection on USB port
10/1000 µs (600W) transient pulse protection on RS485 port
Ethernet
Internet
Modem
GPRS
Gateway
GEM-10
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1.2 LED Functions
POWER GSM GPRS LINK
Green Not
Ready
- Connected to
GPRS
Ethernet Link
Red Ready - - -
Red (flash) - Connecting to
GSM
- -
Red -Green - Signal Strength - -
Green (flash) - - - Ethernet Data
Signal level is very good
Signal level is good
Signal level is moderate
Signal level is low
Signal level is very low
1.3 Placing the SIM card
Place a pen or a screwdriver with a fine tip to the hole next to the SIM card slot and push gently. Place
the SIM card to the opened SIM card tray and slide the tray back in. Turn the power supply of the
device off before placing the SIM card.
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1.4 Driver Installation
Since GEM-10 configuration tool communicates using the USB port of your computer, USB drivers
in accompanying CD must be installed to your computer.
To install the drivers;
1. Connect the device to the USB port of your computer. POWER LED will turn on and your
hardware will be automatically detected.
2. To locate the driver files, click on “Browse my computer for driver software” option.
3. On the next window, select the location of your drivers and click on “Next” button.
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4. Click on “Install this driver software anyway” on the driver compatibility verification window.
5. Your computer will backup your files for System Restore.
6. When the window below is displayed, copying of necessary files to computer is finished.
7. After the installation is finished, you can see your device under Start->Control Panel->Device
Manager->Universal Serial Bus controllers.
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Important: Before inseting the SIM card into the device, disable the PIN code
request of SIM using your mobile phone. Otherwise, GEM-10 will not connect to
Internet.
Configuration
In order to use the GEM-10 configuration program, you must install the .NET Framework program located
in the CD.
2.1 Connection Settings
● TCP Connection Type
If you want the device to connect to the IP address in the “Server IP” box, select the “TCP Client”
option. Otherwise to wait for the incoming TCP connections, select “TCP Server” option.
● Operating Mode
In this section, you can select if your Modbus packages are converted to ModbusTCP or get
tunneled when they are transferred via TCP.
● ModbusTCP Port
It represents the port number which will be used for ModbusTCP.
● TCP Timeout
If GEM-10 is configured as Server, this value represents the waiting time in seconds for GPRS
connection to refresh in case of a data transmission absence.
● Connection Type
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In this section, you can select the interface oon which the ModbusTCP communication will occur.
If you select Ethernet/GPRS option, GEM-10 will first try to connect to server using Ethernet. In
case of failure, the device tries to connect to server IP address using GPRS. After the GPRS
connection is established, GEM-10 continues to send ping requests to the server in 5 second
intervals using Ethernet. If 4 consecutive ping requests get responds, connection via GPRS is
terminated and it is redirected to Ethernet.
This setting is valid only if the device is configured as Client.
● Server IP
If GEM-10 is configured as Client, this adddress represents the IP address to connect to.
2.2 Ethernet Settings
● DHCP Active
It indicates that GEM10 will take its IP address for ethernet connection from a DHCP server.
● IP Address
It shows the IP address of GEM-10 for ethernet connection. If GEM-10 is assigned an IP address
by a DHCP server then this field shows the IP address assigned to GEM-10.
● Gateway
It shows the address of the gateway or modem on which GEM-10 connects to Internet..
● Subnet Mask
It shows the network address to which GEM-10 is connected..
● MAC ID
It shows the unique MAC address of GEM-10.
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● WEB Access Active
This setting enables the user to change the device settings via WEB interface. To enable this
feature, click on this option.
● WEB Port
It indicates the port number which will be used for WEB access.
● Login Timeout
It indicates for how long the device will wait before disabling the user to reenter to WEB access
page if the WEB access page is closed without clicking on the Exit button.
● Password
To change the password which is used for WEB access, activate the “Change Password” option
and enter your new password. Default password is “gem10” and case-sensitive.
** Access to the WEB interface of GEM-10 is only possible by using the ethernet port.
2.3 GPRS Settings
● Username
Username which will be used for GPRS connection.
● Password
Password which will be used for GPRS connection.
● APN
Enter the APN name which is defined by your GSM carrier for GPRS connection.
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● Keep-Alive Interval
It indicates the interval of keep-alive packages sent by GEM-10 to detect idle status of GPRS data
channel.
● Failed Keep Alives
If GEM-10 can't get responses to keep-alive packages as the number defined in this box, it
refreshes the GPRS connection.
● Connection Delay
This option is valid if GEM-10 is set as Client and it indicates the reconnection attempt interval to
the server (monitoring point).
** Please contact your GSM provider for information about your Username, Password and APN
Name.
2.4 RS485 Settings
● Baud Rate
It indicates the communication speed of your device. Supported speeds are 1200, 2400, 4800,
9600, 19200, 38400, 57600 and 115200 bps.
● Data Bit
It indicates how many bits constitute the data package. Supported bit numbers are 5, 6, 7 and 8.
● Stop Bit
In serial communication protocols, stop bit comes after data and parity bits and it indicates the end
of data package. Supported stop bit numbers are 1, 1.5 and 2.
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● Parity
It is the parameter which is used to verify the authenticity of data package. Supported options are
Odd, Even and None.
● Serial Timeout
It indicates for how long the response from the queried device will be waited.
● Delay
It indicates the delay between the response of Modbus device and next transmitted Modbus query
2.5 Firmware Update
You can update GEM-10 to latest fimware from this section.
To do this;
i. Click on Open button and select the firmware file that you will upload.
ii. Click on Update button and start the update process. After the device resets, it will install the
selected file.
iii. After the updating is finished, the device will restart itself and start its operation again.
iv. After the update, the device will start operation with factory settings.
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2.6 Device Info
All hardware/software information is displayed in this section. Additionally; GSM connection state,
GSM signal strength and GPRS IP of modem can be monitored in this section.
Important: For the new settings to take effect, the power supply of the device has to be
switched off and on again.
2.7 Accessing Device Settings via WEB Interface
GEM-10 contains an HTTP server which lets the user to change the device settings remotely. This
way, the user can change device settings without the need of actually being near the device. In order
for this feature to be usable, “WEB Access Active” under WEB Settings must be selected.
To access the device settings;
i. Enter the IP address of GEM-10 into your browser address line.
ii.Enter the WEB access password on the following page (gem10 by factory default).
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iii.A page that shows the device settings will be displayed. By using the menus on the left side, all
device settings can be accessed.
iv. After changing any of the settings on each page, click on “Update” button. When all operations on
pages are finished, click on “Save Settings” option. Your new settings will be saved on the permanent
memory, GEM-10 will restart itself and start its operation again.
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