DC327A Introduction Demonstration Circuit DC327A is a complete DCE or DTE serial port. The protocols supported are V.28 (RS232), V.35, V.36, RS449, EIA530, EIA530A and X.21. Four jumpers select the proper protocol and other port-configuration settings. The board provides a vehicle for observing the line drivers and receivers on the LTC1546 and LTC1545. Logic-level signals enter and exit the board on the left side and line-level signals enter and exit on the right. The internally generated supplies are observable on the pins at the top of the board. DC327A is intended for network equipment that interfaces to other equipment using standard serial connections. These applications include routers and wide area networks. The interface design work is as simple as placing this chipset on a board with a handful of small, inexpensive capacitors.sdfsdfsdf + VDD VCC VCC GND GND VEE J1 J2 DTE TDX DTE TXDA DTE TXDB* LOGIC SIGNALS LINE SIGNALS DCE RXDB DCE RXD DCE RXDA DTE SCTE DTE SCTEB* DTE SCTEA S DCE RXC DCE RXCA DCE RXCB CH1 DTE TXCB DTE TXC DTE TXCA DCE TXC DCE TXCA DCE TXCB DTE RXC DTE RXCA DTE RXCB DCE SCTE DCE SCTEA DCE SCTEB DTE RXD DTE RXDA DTE RXDB S CH3 DCE TXD DCE TXDB DCE TXDA DTE RTS DTE RTSA DTE RTSB DCE CTS DCE CTSB DCE CTSA DTE DTR DTE DTRB DTE DTRA DCE DSR DCE DSRA DCE DSRB DTE DCD DTE DCDB DTE DCDA DCE DCD DCE DCDA DCE DCDB DTE DSRB DTE DSR DTE DSRA DCE DTR DCE DTRA DCE DTRB DC327A LTC1546LTC1545 DTE CTS DTE CTSA DTE DTSB DCE RTS SOFTWARE-SELECTABLE DCE RTSA DCE RTSB MULTIPROTOCOL TRANSCEIVER DTE LL DTE LL DTE RI DCE RI DCE LL DCE RI DTE RI DTE TM DTE RL DCE TM DCE LL DCE RL JP1 JP2 JP3 JP4 DTE TM GND DCE RL M0 M1 M2 DCE/DTE DTE RL DCE TM S CH2 *DTE TXDB AND DTE SCTEB ARE MISLABELED ON SOME BOARDS AS DTE TXDA AND DTE SCTEA Figure 1. DC327A Test and Measurement Setup Quick Start Guide 1. Connect the input voltage power supply, meters, pulse generator and oscilloscope as shown in Figure 1. 2. The pulse generator should be set to a 0V to 5V swing. 3. The mode pins M0, M1 and M2, plus the configuration pin DCE/DTE should be configured for the desired protocol and port setting. (M0 = 0, M1 = 0, M2 = 1 and DCE/DTE = 0 selects the V.35 DTE mode) 4. Observe the waveforms on the logic signal side and the line signal side of the board. The line driver (TXDA, TXDB) is connected to the line receiver (RXCA, RXCB) to demonstrate the line signals. TRS is also connected to DSR. 5. Observe the internally generated supplies (V and V ). EE DD