P-9945RP is an optional card for GST-IFP8 control panel, providing RS485 for system integration of the third party. XS3 and XS4 of P-9945RP Repeater Card can be connected with and XS8, XS1 of GST IFP8. XS4?XS1 of a motherboard?can be connected with Repeater 485. XT14 of the mother board can be connected with repeater panel (including GST852RP, GST8903, GST852RPX).