3: Installation and HardwareXPress DR+ User Guide 20Figure 3-5. Termination Resistor for 2-Wire Connection9-Pin RS-232 to Serial RJ45 Cable (P/N 500-103)The included Lantronix (P/N 500-103) RJ45-DB9F serial cable assumes you areconnecting a typical PC Com port to the XPress DR+ serial port. This cable is pinned toprovide full serial line control to an RS232 DTE device. Lantronix offers acomprehensive list of cables and adapters to simplify device connectivity to the XPressDR+. See B: Lantronix Cables and Adapters for a full listing.Figure 3-6. 9-Pin RS-232 to Serial RJ45 (P/N 500-103) Pinout Table8 CTS (In) 1 RTS (Out)1 DCD (In) 2 DTR (Out)6 DSR (In) 3 TXD2 RXD (In) 4 Signal Ground5 Signal Ground 5 Signal Ground3 TXD (Out) 6 RXD4 DTR (Out) 7 DSR (In )7 RTS (Out) 8 CTS (In)DTE, 9-Pin XPress DR+Female Serial RJ45Ethernet InterfaceThe XPress DR+ includes a two-port unmanaged Ethernet switch with a future option tomigrate to a managed solution.The internal IEEE 802.3-compliant Ethernet switch is non-blocking, using a 1K MACaddress lookup table with store-and-forward architecture. The XPress DR+ supportsauto-negotiation for 10Base-T or 100Base-TX in both full and half-duplex modes, as wellas automatic MDI/MDIX crossover, allowing use of both straight-through or crossedEthernet cables. The unit also supports IEEE 802.1d spanning tree, which protectsagainst the possibility of a network loop.
