Chapter 5. Communications192 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222ADCOM1 (RS232, RJ45 Connector)The RJ45 Connector is provided for COM1 on CPE40016 only. It has the following pinout.Pin No.79 Signal Name DescriptionFigure 48: COM1 Port CPE4001 NC No Connection2 NC No Connection3 TX Transmit Data4 RX Receive Data5 0V Signal Ground6 NC No Connection7 NC No Connection8 NC No ConnectionCOM2 (RS-485, 15-pin Female D-sub Connector) –RX7i CPU/CRU ModelsThis port does not supply +5Vdc volts, therefore RS-485 to RS-232 conversion requires a converter thatis self-powered. It does not support the RS-485 to RS-232 adapter IC690ACC901.This is a DCE port that allows a simple straight-through cable to connect with a standard AT-styleRS-232 port.COM2 RS-485 SignalsPin No. Signal Name Description1 Shield Cable ShieldLocated at the bottom right of the connectoras viewed from the front of the module.2 NC No Connection3 NC No Connection4 NC No Connection5 NC No Connection6 RTS(A) Differential Request to Send A7 0V Signal Ground8 CTS(B‘) Differential Clear To Send9 RT80 Resistor Termination10 RD(A‘)80,81 Differential Receive Data A11 RD(B‘)81 Differential Receive Data B12 SD(A) Differential Send Data A13 SD(B) Differential Send Data B14 RTS(B’) Differential Request To Send B15 CTS(A’) Differential Clear To Send A79 Pin 1 is the leftmost pin as shown in Figure 48.80 To provide termination using the built-in 120Ωresistor, install a jumper between pins 9 and 10.81 To provide termination using an external resistor, connect a user-supplied resistor across pins 10 and 11.
