Editing Communications-Protocol-Keling


== Communications Protocol Keling ==

 
TH MODBUS USER INSTRUCTIONS
 
 
 
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.
 
2, The format of the data reading and writing is same as standard Modbus protocol. Definition as follows:
  Request:
01 03 238(00EE) 0002 42046 (A43E) 
ADD COM PV1 Counts CRC 

  Response: 
01 03 04 6D96 49F3 7166 
ADD COM Counts  PV1 CRC 

  PV1 = 6D96 49F3 = 6D96.49F3H = 6D96H+0. 49F3H=28054.28890
When Max bit is ¡°1¡±, means negative, e.g.:
 PV1=ED9649F3= ED96.49F3H = -(6D96H+0.49F3H) = -28054.28890
 ED96 bit 15=1 is negative, viz. -6D96H
 
3, When setting parameters, can read multi- parameters; when writing, can write 1 parameter only every time
 
4, Commands:
  02H: read digital value / discrete I/O parameters
  03H: read holding registers parameters
  06H: write single holding register parameter value
  10H: write multi holding registers parameters value
  41H: instrument calibration command 
** (when appearing unused command, response  errors.meassage 
Parameter ¡°02H.41H command is not used in DS8 AND TCH SERIERS)
 
5, Communication parameters: 
  
Factory setting  Parameters Parameter address (HEX) Data numbers (bytes) Function Remark 
  FLAG4 104 2 Read and write symbol Read only 
  MV 105 4 PID1 operating value output Read only 
  MV1 168 4 PID2 operating value output Read only 
  PV1 201 4 1st input measuring value  Read only 
  PV2 204 4 2nd input measuring value  Read only 
  SV 0000 4 Set control value R / W 
100 AL1 0004 4 Alarm 1 set value R / W 
900 AL2 0008 4 Alarm 2 set value R / W 
500 AL3 0012 4 Alarm 3 set value R / W 
0£®0 cdB 0016 4 Cooling clearance R / W 
0 AT 0019 2 Set Auto-tune R / W 
000 LCK 0020 2 Set lock function R / W 
0 MAN 0021 2 Set manual or auto manipulation R / W 
001 ADD 0022 2 Set instrument communication address R / W 
0£®0 PSV1 0024 4 PV1  correction value R / W 
0£®0 PSV2 0028 4 PV2  correction value R / W 
1£®0 HY1 0032 4 Alarm 1 hysteresis value R / W 
0 AM1 0035 2 Alarm 1 mode setting R / W 
1£®0 HY2 0036 4 Alarm 2 hysteresis value R / W 
1 AM2 0039 2 Alarm 2  mode setting R / W 
1£®0 HY3 0040 4 Alarm 3 hysteresis value R / W 
2 AM3 0043 2 Alarm 3  mode setting R / W 
3£®0 P 0044 4 PID 1 proportion band R / W 
240 I 0048 4 PID 1 Integral time R / W 
0£®0 D 0052 4 PID 1 differential coefficient time R / W 
0 OUD 0055 2 PID 1 control direction R / W 
1£®0 HYS 0056 4 PID 1 control function R / W 
020 CTL 0059 2 PID 1 control cycle R / W 
0£®0 OUTL  0060 4 PID1 MV output low limit  R / W 
100£®0 OUTH 0064 4 PID1MV output high limit R / W 
0£®0 HUM 0068 4 PID 1 desiccant output limit R / W 
5£®0 Pc 0072 4  PID 2 proportion band  R / W 
240 Ic 0076 4 PID 2 Integral time R / W 
0£®0 Dc 0080 4 PID 2 differential coefficient time R / W 
1 OUC 0083 2 PID 2 control direction R / W 
020 C-t 0084 2 PID 2 control cycle R / W 
K type INP1 0085 2 1st Select input signals R / W 
0.0 LSP 0088 4 1st input low limit display R / W 
1200 USP 0092 4 1st input high limit display R / W 
1 DP1 0095 2 Select decimal point for 1st input  R / W 
0 UNIt 0096 2 Select display unit for 1st input R / W 

 


Sales@EmbeddedRF.com wrote:
I know its an rs-485.