Moxa Technologies MGate 5111 - Dimensions; Pull Up;Down Resistors for RS-485 (Modbus)

MGate 5111 Getting Started
2-5
Dimensions
Unit = mm (inch)
Pull Up/Down Resistors for RS-485 (Modbus)
In some critical 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 up/down resistors correctly so that the
electrical signal is not corrupted. The MGate 5111 uses DIP switches to set the pull up/down resistor values for
each serial port.
To add a 120 Ω termination resistor, set switch 3 on the port’s assigned DIP switch to ON; set switch 3 to
OFF (the default setting) to disable the termination resistor.
To set the pull up/down r es ist ors t o 150 K Ω, set switches 1 and 2 on the port’s assigned DIP switch to OFF.
This is the default setting.
To set the pull up/down resistors to 1 KΩ, set switches 1 and 2 on the port’s assigned DIP switch to ON.
ATTENTION
Do not use the 1 KΩ pull
up/down setting on the MGate 5111 when using the RS-
232 interface. Doing so will
degrade the RS
-232 signals and reduce the effective communication distance.
On the MGate 5111’s left side panel, you will find DIP switches to adjust each serial
port’s pull
-up resistor, pull-down resistor, and terminator.