MGate MB3000 Modbus Gateway User Manual
RS-485 Termination and Pull High/Low Resistors
In some critical 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 or jumper settings are used
to set the pull high/low resistor values. For all models except the MB3180, a built-in 120 termination
resistor can also be enabled.
To modify the termination and pull high/low resistor settings, please refer to the hardware reference chapter
for your model.
ATTENTION
Do not use the 1 KΩ pull high/low setting on the MGate MB3000 when using the RS-232 interface. Doing
so will degrade the RS-232 signals and reduce the effective communication distance.
Connecting to a Host or the Network
A 10/100BaseT Ethernet port is located on the unit’s front panel. This port is used for the unit’s connection
to a host or Ethernet network, as follows:
• For normal operation, use a standard straight-through Ethernet cable to connect the unit to your
Modbus TCP network.
• For initial configuration or for troubleshooting purposes, you may connect the unit directly to a PC. In
this case, use a crossover Ethernet cable to connect the unit to your PC’s Ethernet connector.
The unit’s Link LED will light up to indicate a live Ethernet connection.
For advanced models (MB 3170, MB3170I, MB3270, and MB3270I), two Ethernet ports are provided. One
port can be used to connect to the network, and the other port can be used to connect to another Ethernet
device.
Installing the Software
The Windows management utility is available for download. Please download it from Moxa's website at
http://www.moxa.com. For additional details, please refer to Chapter 9.
Mounting the Unit
The unit can be placed on a desktop, mounted on the wall, or mounted on a DIN-rail. The MB3180, MB3280,
and MB3480 require optional attachments for DIN-rail mounting. For additional details, please refer to the
hardware reference chapter for your model.
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