Moxa Technologies MGate MB3000 Modbus Manuel d'utilisateur télécharger pdf (Page 13)

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

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 52 53

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Moxa Technologies MGate MB3000 Modbus Manuel d'utilisateur Page 13