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| == Communications Protocol Keling == | | == Communications Protocol Keling == |
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| | *[[Media:Communications-Protocol-email.eml]] - Original email file |
| TH MODBUS USER INSTRUCTIONS
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| 1, The instrument RS485 communication BPS is fixed at 9600 bits/s, start bit=1, data bit=8, stop bit=2, starting and ending time >5ms.
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| 2, The format of the data reading and writing is same as standard Modbus protocol. Definition as follows:
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| Request:
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| 01 03 238(00EE) 0002 42046 (A43E)
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| ADD COM PV1 Counts CRC
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| Response:
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| 01 03 04 6D96 49F3 7166
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| ADD COM Counts PV1 CRC
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| PV1 = 6D96 49F3 = 6D96.49F3H = 6D96H+0. 49F3H=28054.28890
| | == THE MODBUS USER INSTRUCTIONS == |
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| When Max bit is ¡°1¡±, means negative, e.g.:
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| PV1=ED9649F3= ED96.49F3H = -(6D96H+0.49F3H) = -28054.28890
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| ED96 bit 15=1 is negative, viz. -6D96H
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| 3, When setting parameters, can read multi- parameters; when writing, can write 1 parameter only every time
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| 4, Commands:
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| 02H: read digital value / discrete I/O parameters
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| 03H: read holding registers parameters
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| 06H: write single holding register parameter value
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| 10H: write multi holding registers parameters value
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| 41H: instrument calibration command
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| ** (when appearing unused command, response errors.meassage
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| Parameter ¡°02H.41H command is not used in DS8 AND TCH SERIERS)
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| 5, Communication parameters:
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| Factory setting Parameters Parameter address (HEX) Data numbers (bytes) Function Remark
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| FLAG4 104 2 Read and write symbol Read only
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| MV 105 4 PID1 operating value output Read only
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| MV1 168 4 PID2 operating value output Read only
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| PV1 201 4 1st input measuring value Read only
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| PV2 204 4 2nd input measuring value Read only
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| SV 0000 4 Set control value R / W
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| 100 AL1 0004 4 Alarm 1 set value R / W
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| 900 AL2 0008 4 Alarm 2 set value R / W
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| 500 AL3 0012 4 Alarm 3 set value R / W
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| 0£®0 cdB 0016 4 Cooling clearance R / W
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| 0 AT 0019 2 Set Auto-tune R / W
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| 000 LCK 0020 2 Set lock function R / W
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| 0 MAN 0021 2 Set manual or auto manipulation R / W
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| 001 ADD 0022 2 Set instrument communication address R / W
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| 0£®0 PSV1 0024 4 PV1 correction value R / W
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| 0£®0 PSV2 0028 4 PV2 correction value R / W
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| 1£®0 HY1 0032 4 Alarm 1 hysteresis value R / W
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| 0 AM1 0035 2 Alarm 1 mode setting R / W
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| 1£®0 HY2 0036 4 Alarm 2 hysteresis value R / W
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| 1 AM2 0039 2 Alarm 2 mode setting R / W
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| 1£®0 HY3 0040 4 Alarm 3 hysteresis value R / W
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| 2 AM3 0043 2 Alarm 3 mode setting R / W
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| 3£®0 P 0044 4 PID 1 proportion band R / W
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| 240 I 0048 4 PID 1 Integral time R / W
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| 0£®0 D 0052 4 PID 1 differential coefficient time R / W
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| 0 OUD 0055 2 PID 1 control direction R / W
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| 1£®0 HYS 0056 4 PID 1 control function R / W
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| 020 CTL 0059 2 PID 1 control cycle R / W
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| 0£®0 OUTL 0060 4 PID1 MV output low limit R / W
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| 100£®0 OUTH 0064 4 PID1MV output high limit R / W
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| 0£®0 HUM 0068 4 PID 1 desiccant output limit R / W
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| 5£®0 Pc 0072 4 PID 2 proportion band R / W
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| 240 Ic 0076 4 PID 2 Integral time R / W
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| 0£®0 Dc 0080 4 PID 2 differential coefficient time R / W
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| 1 OUC 0083 2 PID 2 control direction R / W
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| 020 C-t 0084 2 PID 2 control cycle R / W
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| K type INP1 0085 2 1st Select input signals R / W
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| 0.0 LSP 0088 4 1st input low limit display R / W
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| 1200 USP 0092 4 1st input high limit display R / W
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| 1 DP1 0095 2 Select decimal point for 1st input R / W
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| 0 UNIt 0096 2 Select display unit for 1st input R / W
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| Sales@EmbeddedRF.com wrote:
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| I know its an rs-485.
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