S428A Manual - Danaher Specialty Products

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DYNAPAR brand PRODUCT MANUAL: Series S428A 1/8 DIN Process IndicatorASCII CommunicationsThis is a simple ASCII protocol that providesbackwards compatibility with previousgenerations of products. ASCII is not availablein all models in the range. The Modbusprotocol is recommended for future use.Refer to the relevant Model Group Sectionfor the ASCII and Modbus Application Layer(parameter address/ident information).Physical LayerThe Base address, bit rate and characterformat are configured via the front panel inConfiguration Mode or by using the PCConfigurator software.Physical layer configuration settings possibleare:Data rate: 1200, 2400, 4800(default), 9600 and 19,200 bpsParity: EvenCharacter format: 7 bits percharacter. + 1 stop bit.The transmitter must not start transmissionuntil 3 character times have elapsed sincereception of the last character in a message,and must release the transmissionline within 3 character times of the lastcharacter in a message.Note: Three character times = 1.5ms at19200, 3ms at 9600, 6ms at 4800, 12msat 2400 and 24ms at 1200 bps.Device AddressingThe instrument is assigned a device addressby the user using the 5DD9 parameterin Configuration Mode. The addressmay be set to any unique value from 1(default) to 99. This address is used torecognize ASCII messages intended for thisinstrument. The instrument does not respondto messages that do not match theaddress that has been assigned to it.Session LayerThe ASCII protocol assumes half duplexcommunications. The master device initiatesall communication. The master sendsa command or query to the addressed slaveinstrument and the slave replies with anacknowledgement of the command or thereply to the query.Messages from the master device may beone of five types:Type 1: {S}{N}??*Type 2: {S}{N}{P}{C}* or R{N}{P}{C}*Type 3: {S}{N}{P}#{DATA}* orR{N}{P}#{DATA}*Type 4: {S}{N}{P}I* or R{N}{P}I*Type 5: {S} {N} \ P S S ? *All characters are in ASCII code. See thefollowing Parameter Key table for details ofthe parameters in brackets { }.{S}is the Start of Message character L (Hex 4C) or R (Hex 52). L is used for Controllers; R is used for Profilers.{N} is the slave device address (in the range 1 - 99); addresses 1 - 9 may be represented by a singledigit (e.g. 7) or in two-digit form, the first digit being zero (e.g. 07).{P } is a character which identifies the parameter to be interrogated/modified.{C} is the command (Refer to the Serial Communications Application Layer information for each Model Group)# indicates that {DATA} is to follow (Hex 23){DATA} is a string of numerical data in ASCII code (refer to the Data Element table below)P is the Program NumberS S is the Segment Number (01 to 16)* is the End of Message Character (Hex 2A)No space characters are permitted in messages. Any syntax errors in a received messagewill cause the slave instrument to issue no reply and await the Start of Message character.4.10Manual Number: 702683-0001 Rev.: A May, 2006 Serial Communications
DYNAPAR brand PRODUCT MANUAL: Series S428A 1/8 DIN Process IndicatorASCII CommunicationsASCII Data Element . Sign/Decimal Point Position{DATA} Content Data Format Descriptionabcd0 +abcd Positive value, no decimal placeabcd1 +abc.d Positive value, one decimal placeabcd2 +ab.cd Positive value, two decimal placesabcd3 +a.bcd Positive value, three decimal placesAbcd5 -abcd Negative value, no decimal placeAbcd6 -abc.d Negative value, one decimal placeAbcd7 -ab.cd Negative value, two decimal placesAbcd8 -a.bcd Negative value, three decimal places(in the Data Content, abcd represents the data value, the last digit indicates data format)Type 1 MessageL {N} ? ? *This message is used by the master deviceto determine whether the addressed slavedevice is active.The reply from an active slave isL {N} ? A *An inactive device will give no reply.Type 2 MessageL {N} {P} {C} * or R {N} {P} {C} *This type of message is used by the masterdevice, to interrogate or modify a parameterin the addressed slave device. {P} identifiesthe parameter and {C} represents thecommand to be executed, which may beone of the following:+ (Hex 2B) = Increment the value of theparameter defined by {P}. (Hex 2D) = Decrement the value of theparameter defined by {P}? (Hex 3F) = Determine the current valueof the parameter defined by {P}The reply from the addressed slave deviceis of the form:L {N} {P} {DATA} A * or R {N} {P} {DATA} A *where {DATA} comprises five ASCII-codeddigits whose format is shown in the DataElement table above. The data is the valuerequested in a query message or the newvalue of the parameter after modification. Ifthe action requested by the message fromthe master device would result in an invalidvalue for that parameter (either because therequested new value would be outside thepermitted range for that parameter or becausethe parameter is not modifiable), theslave device replies with a negative acknowledgement:L {N} {P} {DATA} N * or R {N} {P} {DATA} N *The {DATA} string in the negative acknowledgementreply will be indeterminate. If theprocess variable or the deviation is interrogatedwhilst the process variable is outsidethe range of the slave device, the reply is:L {N} {P} < ? ? > 0 A *if the process variable is over-range, orL {N} {P} < ? ? > 5 A *if the process variable is under-range.Manual Number: 702683-0001 Rev.: A May, 2006 Serial Communications 4.11
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