Jumper Setting - Exsys EX-45352 Bedienungsanleitung

Seriell RS-422/485 PCIe Board

3.3 Jumper setting

There are 2 sets of the jumpers to set the settings for port 1 (S1) and port 2 (S2)
respectively.
1. Mode Selection Jumper: JP4 for S1 and JP7 for S2
2. Termination Resistor Enable/Disable Jumper: JP8 for S1 and JP9 for S2
3. Echo or No Echo Selection Jumper: JP5 for S1 and JP6 for S2
4. TXD Control Selection Jumper: JP2 for S1 and JP3 for S2
1. Mode Setting:
JP4 for S1 Port
JP7 for S2 Port
485-2W =
485-4W =
422
2. Termination Resistor Enable/Disable:
This jumper enables/disables the 120 Ohm termination resistor between DATA+ and
DATA- of the RS485 transceiver:
JP8 for S1 Port
JP9 for S2 Port
OFF ON
OFF
ON
3. Echo or No Echo Settings:
This jumper is to set the transmission data will be echoed back or not. The Echo
mode is useful for the application program to detect if the RS485 bus has collision. If
the echoed data was not equal to the transmitted data, then the bus was in a colli-
sion. This setting only affects the RS485 2-wire mode. It doesn't affect RS485 4-
wire, RS422, and RS232 modes.
JP5 for S1 Port
JP6 for S2 Port
OFF ON
OFF
ON
RS-485 Mode with 2-wire (Default)
RS-485 Mode with 4-wire
= RS-422 Mode
= Termination Resistor Disabled (Default)
= Termination Resistor Enabled
= No Echo Data (Default)
= Transmission data will be echoed
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