Kenwood TS-2000 Instruction Manual

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Kenwood TS-2000 Instruction Manual Manual pdf 121 page image

11321 APPENDIXCOM CONNECTORAll descriptions in the PC CONTROL COMMANDTABLE are for the users convenience only.KENWOOD will not support or warrantee thisdocumentation in any way.HARDWARE DESCRIPTIONThis transceiver uses a full-duplex, asynchronous,serial interface for communicating through the male9-PIN RS-232C COM connector. Each data isconstructed with 1 start bit, 8 data bits, and 1 stop bit(4800 bps must be configured as 2 stop bits). Noparity is used. The pinout and the pin functions of theCOM connector are shown below:COM123459 8 7 6Rear panel view123456789—Transmit dataReceive data—Signal ground—Receive enableTransmit enable——OutputInput——InputOutput—COMPin No.COM Pin Name(Ref.: Computer) Function(Ref.: Transceiver) I/ONCRXDTXDNCGNDNCRTSCTSNCRXD: Transmit data is serial data transferred fromthe transceiver to the computer.TXD: Receive data is serial data transferred fromthe computer to the transceiver.GND: Signal ground pinRTS: This signal is applied to the transceiver. It isused to inhibit transmit data from the transceiverwhen the computer is not ready to receive data.Transmit data is inhibited when the level is low.CTS: This signal is applied from the transceiver. Itis used to inhibit transmit data from the computerwhen the transceiver is not ready to receive data.Transmit data is stopped when the level is low.CONTROL OPERATIONMost computers handle data in the form of “bits” and“bytes”. A bit is the smallest piece of information thata computer can handle. A byte is composed of eightbits. This is the most convenient form for mostcomputer data. This data may be sent in the form ofeither serial or parallel data strings. The parallelmethod is faster but more complicated, while theserial method is slower and requires less complicatedequipment. The serial form is, therefore, a lessexpensive alternative.Serial data transmission uses time-division methodsover a single line. Using a single line also offers theadvantage of reducing the number of errors due toline noise.Only 3 lines are required theoretically for control ofthe transceiver via the computer:• Transmit data• Receive data• GroundFrom a practical standpoint, it is also necessary toincorporate some means of controlling when this datatransfer will occur. The computer and transceivercannot be allowed to send data at the same time!The required control is achieved by using the RTSand CTS lines.For example, the transceiver is placed into thetransmit mode whenever the character string “TX;” issent from the computer. The character string “TX;” iscalled a computer control command. It tells thetransceiver what to do. There are numerouscommands available for control of the transceiver.These commands may be incorporated into acomputer program written in any high level language.Programming methods vary from computer tocomputer; therefore, refer to the instruction manualsprovided with the terminal program and computer.