User`s manual

MGate MB3000 User’s Manual Getting Started
2-5
switches or jumper settings are used to enable a 120 Ω termination resistor and set the pull
high/low resistor values.
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. This function is only
available for the MGate MB3480.
To set the pull high/low resistors to 150 KΩ, set switches 1 and 2 on the port’s assigned DIP
switch to OFF for the MGate MB3480. For the MGate MB3180, leave jumpers JP3 and JP4 open
(not shorted). This is the default setting.
To set the pull high/low resistors to 1 KΩ, set switches 1 and 2 on the port’s assigned DIP
switch to ON for the MGate MB3480. For the MGate MB3180, short jumpers JP3 and JP4 with
jumper caps.
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.
MGate MB3180 jumpers
JP3,JP4