Kenwood TS-570D User Manual - Page 68
MCP AND TNC
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15 CONNECTING PERIPHERAL EQUIPMENT MCP AND TNC Use the ACC 2 connector to connect the input/output lines from a Terminal Node Controller (TNC) for Packet operation, a Multimode Communications Processor (MCP) for operation on Packet, PacTOR, AMTOR, G-TORTM, or FAX, or from a Clover interface. Also use the ACC 2 connector to connect SSTV and phone patch equipment. • Connect the TNC or MCP to the ACC 2 connector using a cable equipped with a 13-pin DIN plug. • Connecting the TNC or MCP to a personal computer or dumb terminal requires an RS-232C cable. Note: ◆ Do not share a single power supply between the transceiver and the TNC or MCP. Keep as wide a separation as possible between the transceiver and the computer as practical to reduce noise-pickup by the transceiver. ◆ The output voltage of Pin No. 6 (SMET) is not 0 V even when no signal is present. In addition, the output voltage differs between FM (approx. 2.8 ~ 3.8 V) and other modes (approx. 0.5 ~ 3.8 V). When connecting this pin to peripheral equipment such as a personal computer, the input impedance of that equipment must be higher than 1 MΩ. If you connect to equipment having lower impedance, the S-meter will not give accurate readings. Pin No. 1 2 3 Pin Name NC RTK ANO 4 GND 5 PSQ 6 SMET 7 NC 8 GND 9 PKS 10 NC 11 PKD 12 GND 13 SS Function Not connected RTTY key input AF output from receiver • Connect to TNC or MCP receive data pin for digital operation. • AF output level is independent of AF control setting. • AF output level can be changed via Menu No. 34. • Output impedance: 4.7 kΩ Shield for pin 3 Squelch control • Connect to TNC or MCP squelch control pin for digital operation. • Prevents the TNC from transmitting while the receiver squelch is open. • Squelch open: Low impedance • Squelch closed: High impedance S-meter output Not connected Chassis ground Transceiver PTT line control • Connect to TNC or MCP transmit/receive switching pin for digital operation. • Microphone audio input is muted when the transceiver is switched to the transmit mode. Not connected Microphone audio input • Connect to TNC or MCP transmit data pin for digital operation. Shield for pin 11 PTT control (in parallel with MIC jack) for connecting a footswitch or other external controller Black Red TNC/MCP power supply TNC/MCP Personal computer dumb terminal 62 TS-570 13 9 10 11 12 56 78 12 34 PS-53 ACC 2 Connector (Rear panel view)