Serial Ports Connectors; Serial Ports Configuration Switches - Technology SPX5 User Manual

Serial Ports Connectors

To connect the SPX5 to serial networks, the COM1 and COM2 connectors, shown on figure
4, are used. Terminals R- and R+ are used for transmit and receive in RS485 networks. In the
case of RS422 networks R+ and R- are used for reception whereas T+ and T- are used for the
transmission pair.
Figure 4. Serial Network Connector showing RS232/RS485 connections

Serial Ports Configuration Switches

The SPX allows configuring Pull Up, Pull Down and termination resistors in the RS485/RS422
network. This configuration is done through the dip switches in the front of the equipment.
In Figure 5, the operation of the switches is shown. The recommended normal operation of
the SPX5 is having all switches OFF, however when the SPX5 is the first or last device on the
network, the termination must be switched to ON.
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