The SPR system protection relay features an integral RS485 communication port, allowing direct connection to SCADA systems via Modbus RTU protocol. However, the SCADA systems or PC based equipment used for remote monitoring of electrical and power parameters often incorporate RS232 communication ports, therefore conversion to RS485 is necessary. The 9D-485 module is a simple non-isolated two wire half duplex RS485 converter which fits into any PC based system.

This port powered two-channel module converts the TD and RD RS232 lines to balanced half-duplex RS485 signals via a 9 way female D type connector on the RS232 side, and a screw clamp terminal block connector on the RS485 side. The module has an internal connection to prevent data transmitted from the RS232 port from being echoed back to the RS232 port.

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