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Interface description
R2600 / R2601
3-348-815-15
6/11.03
DIN Draft 19244 Interface
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CONTENTS Page Page 1 General ...................................................................................... 4 4 Parameter indices of the equipment parameters ........................ 24 1.1 Interface hardware ............................................................. 4 4.1 Temperature parameters ................................................. 24 1.2 Communications protocol ................................................... 4 4.2 Control parameters ..................................
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GOSSEN METRAWATT GMBH 4 1 General 1.1 Interface hardware To communicate with a host computer, an SPS, etc., the controllers R2600 / 01 must be equipped with marking F1. In this case, the controllers are equipped with a serial interface having the following data: • Level types RS-232 and RS-485 (two-wire) in the unit selectable • Baud rate 9600 bd • Character format 8 data bits, 1 parity bit, 1 stop bit • Parity Even • Maximum number of equipment on the bus: 32 • With RS-485 bus operation, each
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1.3 How to connect the interface 1.3.1 RS-232 connection When using the a RS-232 interface, only one R2600/01 can be connected to a master (e.g. PC), for example, for pre-loading the unit with user-specific data. Sub-D socket R2600/01 Number 25 9 of pins: DCD 8 1 RxD 3 2 20 TxD TxD 2 3 21 RxD DTR 20 4 Gnd 7 5 19 Gnd DSR 6 6 RTS 4 7 CTS 5 8 Depending upon the driver software, the jumpers on the master side can be omitted and/or can be different. GOSSEN METRAWATT GMBH 5
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GOSSEN METRAWATT GMBH 6 1.3.2 RS-485 connection When using a RS-485 interface, as many as 32 equipment (R2600/01 and others) can be connected to the bus. Thereby, all terminals A, B and/or C are interconnected in parallel. The wiring must be made from equipment to equipment and must not be a star con- nection. With longer bus lines (longer than about 5 m) the bus should be terminated at both ends with the characteristic impedance (e.g. 200 Ω between A and B). Master R2600/01 R2600/01 A 21 21 B
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Following, the master may only become active again, when – it receives a reply telegram from the addressed equipment and the specified wait time after a reply telegram (t aw) has elapsed, or – the maximum specified response delay time (t av) has elapsed. Within a telegram, pauses of limited duration (t zv = character delay time) may occur between 2 character transmissions. 1.5 Time action Ready to send/receive after turn-on t ber approx. 5 s Character delay time (R2600 transmitter) t zvs<3ms Cha
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GOSSEN METRAWATT GMBH 8 2 Telegram structure All telegrams consist of one of 3 sets in both request and reply direction, they differ in their principal structure. Their use is fixed for each interface function of the R2600/01. Structure and use of the set types are described as follows. 2.1 Short set Short sets are used on the request side (from the master) • for transmission of short instructions to the equipment (e.g. Reset) • for short requests of important data from the equipment (e.g. even
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2.2 Control set The R2600/01 uses control sets on the request side only. They serve to request all equipment data that cannot be requested via a short set because a detailed specification is required for them. Principal construction control set Character No. Contents Meaning Remarks 1 68h Start character 2 3 and/or 6 Length Number of characters from equipment address to checksum exclusive 3 3 and/or 6 Length (repeat) 4 68h Start character (repeat) 5 0 ... FAh, FFh Equipment address Addr and/or
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GOSSEN METRAWATT GMBH 10 2.3 Long set The R2600/01 uses long sets to transmit instructions and parameters to the equipment and to receive data from the equipment. Principal construction long set Character No. Contents Meaning Remark 1 68h Start character 2 Length Number of characters from equipment address to checksum exclusive 3 Length (repeat) 4 68h Start character (repeat) 5 0 ... FAh, FFh Equipment address Addr and/or 255 (see 2.4.1) 6 Function field (FF) see 2.4.2. 1) 7 see 2.4.3. Paramet
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2.4 Function and value range of the format characters 2.4.1 Equipment address • 0 ... 250 Range for individual equipment addresses = interface address Addr • 255 All equipment connected to a bus can simultaneously be addressed under this address. Data and instructions entered with this address are accepted by all equipment, but there is no acknowledgement made to the master. 2.4.2 Function field (FF) The function field contains • with the short set the proper user information, predefined by bit
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GOSSEN METRAWATT GMBH 12 2.4.2.2 Function coding of the function field (FF) in response direction Bit No. Function Value Meaning 0 ... 2 Reserved 0, 0, 0 (fixed) 3 Request disable 0 Instruction executed, equipment ready 1 Equipment not ready for this instruction, eventually repeat instruction 4 Instruction acknowledgement 0 Instruction executed, equipment ready 1 Instruction could not be executed, equipment ready 5 Transmission error 0 Request telegram correct 1 Request telegram incorrect 6 Not
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2.4.3 Parameter index (PI) The type of the data to be transmitted is defined via the parameter index. The "PI" character is interpreted as follows: Bit 7-4 Bit 3-0 0 ... Fh 0 ... Fh Selection number for main parameter group Selection number for a special parameter in the main group Functionally used data and/or setting parameters of an equipment are combined in the main parameter groups. Only those parameter indices docu- mented in section 4 can be addressed in the R2600/01, an error message is
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GOSSEN METRAWATT GMBH 14 2.5 Criteria for the validity of a request telegram The R2600/01 checks the characters of the telegrams received in accordance with the following tables: For short set: For control and long set: Character No. Criterion Character No. Criterion 1 10h 1 68h 2 Interface address Addr or 255 (see 2.4.2) 2 Note length for PS and end character 3 FF = valid function coding 3 Character 3 = character 2 4 PS = Addr or 255 + FF 4 68h 5 16h 5 Interface address Addr or 255 6 FF = 69h o
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3 Telegram contents R2600/01 3.1 Equipment reset The addressed equipment performs a hardware reset same as in the case of a short interruption of the auxiliary voltage. Example: Equipment address = 2 Request from master (short set): 10h 02h 09h 0Bh 16h FF PS R2600/01 response: None 3.2 Interrogation: Equipment OK? The addressed equipment shows the function field only: Example: Equipment address = 3 Request from master (short set): 10h 03h 29h 2Ch 16h FF PS R2600/01 response (short set): 10h 03h
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GOSSEN METRAWATT GMBH 16 3.3 Request for cycle data You will get the most important measuring and output values of the controller in one data package. Cyclic requests of these values are thus made possible in compact form (short set request. Example: Equipment address = 2 Request from master (short set): 10h 02h 89h 8Bh 16h FF PS R2600/01 response (long set, see 2.3): 68h 09h 09h 68h 02h „FF“ Data block „PS“ 16h 7 characters See 2.4.2.2 for contents of the function field (FF) The 7 characters o
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3.4 Request for event data The event date, combined in 2 words, contain all error messages and alarms of the equipment. They can be called up via short set to identify a special error. This request can be made asynchronous, for example, if the service request bit (collected errors) was set before in any random response telegram in the function field (FF). Example: Equipment address = 5 Request from master (short set): 10h 05h A9h AEh 16h R2600/01 response (long set, see 2.3): 68h 06h 06h 68h
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GOSSEN METRAWATT GMBH 18 Character Bit No. Meaning Display on equipment Remark 0 Sensor breakage measuring circuit 2 1 Wrong polarity measuring circuit 2 2 Analog error 3 Sensor breakage measuring circuit 1 1. 4 Wrong polarity measuring circuit 1 5 Low limit 1 fallen below Associated 6 Low limit 2 fallen below data Status error display 7 High limit 1 exceeded word 1 flashes 8 High limit 2 exceeded (control loop) 1) 9 Impermissible parameter, see 2.5 10 1) 11 Error in heating circuit 2. 1)
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0 Sensor error position readback 1 Sensor error heating current 2 3 3. 4 Heating current not "off" with positioning signal switched off Current display Heating current < 80 % of the set point of the heating current with flashes 5 active positioning signal Error status word 2 6 (heating 7 current 2) 8 EEPROM error monitor, 9 equipment) 10 Function error of rotary button 11 Error of measured value calibration 4. 12 13 Invalid combination of markings 14 15 1) These error bits are deleted afte
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GOSSEN METRAWATT GMBH 20 3.5 Request data from R2600/01 This communication makes it possible to request all values, parameters, configurations, states and equipment markings. Thereby, the data is individually addressed per parameter index. See section 4 for the complete list of all parameter indices. 3.5.1 Request an equipment specification The parameter index lies between 30h and 3Fh. Thus the characters "from/to channel" and "receipt No." in the control and long set are omitted. Example: Requ
