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MGate MB3480
Quick Installation Guide
Fourth Edition, June 2008
1. Overview
The MGate MB3480 is a 4-port Modbus gateway that converts between
Modbus TCP and Modbus RTU/ASCII protocols. It can be used to allow
Ethernet masters to control serial slaves, or to allow serial masters to
control Ethernet slaves. Up to 16 TCP masters and 124 serial slaves can
be connected simultaneously.
2. Package Checklist
Before installing the MGate MB3480 Modbus gateway, verify that the
package contains the following items:
y1 MGate MB3480 Modbus gateway
yDocument & Software CD
yMGate MB3480 Quick Installation Guide
yProduct Warranty Statement
Optional Accessories
yDK-35A: DIN-rail mounting kit (35 mm)
Notify your sales representative if any of the above items is missing or
damaged.
3. Hardware Introduction
As shown in the following figures, the MGate MB3480 has 4 DB9 male
ports for transmitting serial data.
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Reset Button—The reset button is used to load factory defaults. Hold the
reset button down for five seconds using a pointed object such as a
straightened paper clip. Release the reset button when the Ready LED
stops blinking.
LED Indicators—Six LED indicators are located on the top panel:
Name Color Function
On: Power is on and the unit is booting
up
Red Blinking: IP conflict exists, or DHCP or
BOOTP server did not respond
properly.
On: Power is on and the unit is
functioning normally
Green Blinking: Unit has found by the Location
command in MGate Manager.
Ready
Off Power is off or power error condition exists
Orange 10 Mbps Ethernet connection
Green 100 Mbps Ethernet connection
Link
Off Ethernet cable is disconnected or has a short
Orange Unit is receiving data from device
Green Unit is transmitting data to device
P1, P2,
P3, P4 Off No data is being exchanged with device
4. Hardware Installation Procedure
STEP 1: After unpacking the unit, connect the power supply or power
adaptor to the unit.
STEP 2: Use a standard straight-through Ethernet cable to connect the
unit to a network hub or switch. Use a cross-over Ethernet
cable if you are connecting the gateway directly to a PC.
STEP 3: Connect your device to the desired port on the unit.
STEP 4: Place or mount the unit. The unit may be placed on a
horizontal surface such as a desktop, mounted on a DIN-rail, or
mounted on the wall.
Wall or Cabinet Mounting
Two metal plates are provided for mounting the unit
on a wall or inside a cabinet. Attach the plates to the
unit’s rear panel with screws. With the plates attached,
use screws to mount the unit on a wall.
For each screw, the head should be 6.0 mm or less in
diameter, and the shaft should be 3.5 mm or less in
diameter.
6.0 mm
3.5 mm
DIN-rail Mounting
DIN-rail attachments can be purchased separately to mount the MGate
MB3480 on a DIN-rail. When mounting the unit on a DIN-rail, make sure
that it is oriented with the metal springs on top.
Wall Mounting DIN-rail Mounting
Termination Resistor and Adjustable Pull High/Low Resistors
For some RS-485 environments, you may need to add termination
resistors to prevent the reflection of serial signals. When using
termination resistors, it is important to set the pull high/low resistors
correctly so that the electrical signal is not corrupted. For each serial port,
DIP switches are used for termination resistor and pull high/low resistor
settings. To enable the 120 Ωtermination resistor, set switch 3 on the
assigned DIP switch to ON; set it to OFF (the default setting) to disable
the termination resistor. To set the pull high/low resistors to 150 KΩ(the
default setting), set switches 1 and 2 on the assigned DIP switch to the
OFF position; set them both to ON for 1 KΩ.
P/N: 1802034800011
