CAI 600 Series User Manual

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CAI 600 Series User Manual Manual pdf 56 page image

SECTION 13 APPENDIXCalifornia Analytical Model 600 CLD C_ETL_US/CE Operators ManualMarch 2006 Page 48 of 8513.1 Serial Interface and AK-CommandsThe serial interface enables remote control of the Model 600 analyzer by a master computer. It isimplemented as an RS232 V24 interface and meets all requirements of the AK protocol.A 9-pin male connector at the back of the unit is used to connect a master computer with thefollowing pin assignment:Pin 3 = Txd (transmit)Pin 2 = Rxd (receive)Pin 5 = Gnd (ground)Interface ParametersBaud rate: 9600, 4800, 2400, 1200, 600, 300 baudData bits: 7 or 8Stop bit: 1 or 2Don't care: 1 byte, adjustable (e.g. 32)Parity: Even, odd, noneXON/XOFF: Active or not activeGeneral AK Requirements1) If the command message contains no error, the acknowledge message contains the echo ofthe function code and the error status number (1 to 9).2) If the transfer was faulty or the function code unknown, the answer contains four questionmarks (example. "???? 0").3) If the displayed value is not valid, a "#" is placed in front of the measured value (example:"AIKG 0 #9999").4) If a control or adjusting command is sent via the serial interface while the measuring device isin "Manual" mode, it sends an answer like "SLIN 0 K0 OF".5) If a channel does not exist, the answer for control and adjusting commands is e.g. "ATEM 0 3NA" in which 3 is the number of the sub-channel.6) If the device is busy with a running function (SLIN, for example), every arriving controlcommand is ignored (except SRES and STBY); and the response message is e.g. "SMAN 0BS. If In the mode "SINT" an additional "SINT KO" command is received, the integrator isreset to 0 and the integration is restarted.7) If the command message contains data that the measuring device cannot process ("ESYZ K0ABC", for example), the response message is "ESYZ 0 SE". A syntax error is recognized if thedata does not match the expected format or if the parameters do not fit the expected size.8) Numbers are in floating-point format with decimal point. The decimal point can be dropped forintegers.9) If you switch from "Manual" to "Remote" at the device, it remains in "Manual" mode until a"SREM K0" is received by the control computer. On the display, this mode is indicated byREME" (Remote enable) on the status line. In manual mode, query commands via the serialinterface are possible at any time.