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RSU-503 Redundancy Switch Unit Installation ... - Comtech EF Data

RSU-503 Redundancy Switch Unit Installation ... - Comtech EF Data

RSU-503 Redundancy Switch Unit Maintenance 4.5 Internal Connections The internal connections are not normally seen by the user, since the switch is designed to prevent the weather from damaging the internal circuitry. However, if the switch must be opened, pinouts of the three internal connectors have been provided. Refer to Figure 4-3 for location of the internal connections. Figure 4-3. Internal Connections Rev. 8 4–5

Maintenance RSU-503 Redundancy Switch Unit 4.5.1 Serial Interfaces (J19, J20, J21) The internal Serial Interface connectors are 9-pin D with the following pinouts: Pin # Name Function RS-232 RS-485 1 GND 2 TD/TX Transmit Data 3 RD/RX Receive Data 4 +RX/TX 5 GND 6 DSR Data Set Ready (Tied high) (see Note 1) 7 RTS -RX/TX Ready to Send (see Note 2) 8 CTS Clear to Send (see Note 2) 9 -RX/TX Notes: 1. J19 and J20 do not use DSR on pin 6. 2. Clear to Send (CTS) is tied to Ready to Send (RTS) in RS-232 mode. 4–6 Rev. 8

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