block. Serial communication is only capable of readingparameters containing data type 9 (text string).15-40 FC Type to 15-53 Power Card Serial Number containdata type 9.For example, read the unit size and mains voltage range in15-40 FC Type. When a text string is transferred (read), thelength of the telegram is variable, and the texts are ofdifferent lengths. The telegram length is defined in thesecond byte of the telegram, LGE. When using texttransfer, the index character indicates whether it is a reador a write command.To read a text via the PWE block, set the parametercommand (AK) to ’F’ Hex. The index character high-bytemust be “4.”Some parameters contain text that can be written via theserial bus. To write a text via the PWE block, set theparameter command (AK) to ’F’ Hex. The index charactershigh-byte must be “5.”PWE high PWE lowRead textWrite text130BA275.10PKE INDFx xx 04 00Fx xx 05 00Illustration 7.11 PWE7.4.11 Data Types SupportedUnsigned means that there is no operational sign in thetelegram.Data types Description3 Integer 164 Integer 325 Unsigned 86 Unsigned 167 Unsigned 329 Text string10 Byte string13 Time difference33 Reserved35 Bit sequenceTable 7.6 Data Types Supported7.4.12 ConversionThe various attributes of each parameter are displayed inthe section factory settings. Parameter values aretransferred as whole numbers only. Conversion factors aretherefore used to transfer decimals.4-12 Motor Speed Low Limit [Hz] has a conversion factor of0.1.To preset the minimum frequency to 10 Hz, transfer thevalue 100. A conversion factor of 0.1 means that the valuetransferred is multiplied by 0.1. The value 100 is thusperceived as 10.0.Examples:0 s⇒conversion index 00.00 s⇒conversion index -20 ms⇒conversion index -30.00 ms⇒conversion index -5Conversion index Conversion factor1007574676 10000005 1000004 100003 10002 1001 100 1-1 0.1-2 0.01-3 0.001-4 0.0001-5 0.00001-6 0.000001-7 0.0000001Table 7.7 Conversion Table7.4.13 Process Words (PCD)The block of process words is divided into two blocks of16 bits, which always occur in the defined sequence.PCD 1 PCD 2Control Telegram (master⇒follower Controlword)Reference-valueControl Telegram (follower⇒master) StatuswordPresent outputfrequencyTable 7.8 PCD SequenceRS-485 Installation and Set... Design GuideMG20Z202 Danfoss A/S © Rev. 06/2014 All rights reserved. 1537 7
