User manual HANNA INSTRUMENTS HI 700

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[. . . ] HI 700 / HI 710 Series Process, Panel-mounted, Microprocessor-based, Conductivity and TDS Controllers Instruction Manual Dear Customer, Thank you for choosing a Hanna Product. This instruction manual has been written for the following products: HI 700221- EC controller with dual setpoint, ON/OFF and PID controls, analog output. HI 700222- EC controller with dual setpoint, ON/OFF and PID controls, RS485 port. HI 710221- EC and TDS controller with dual setpoint, ON/OFF and PID controls, analog output. [. . . ] To terminate the line, an external resistor equal to the characteristic line impedance (typically 120) must be added at both ends of the line. The RS485 port is optoisolated from measuring circuit and power line. The analog output and RS485 port have the same ground. RS485 PROTOCOL The commands sent to the controller must have the following format: · 2-digit process ID number · 3-character command name · Parameters (variable length, may be null) · End of command (always the CR character, Hex 0D) A maximum time interval of 20 ms is allowed between two consecutive characters of a command. Up to 32 units can be connected to the same RS485 line, with a total line length of up to 1. 2 Km using 24AWG cable. To minimize electromagnetic interferences, use shielded or twisted pair cable to connect the units. Each unit is identified by its process ID number (setup item "01"). The controller acts as a "slave" device: it only answers to commands received from a "master" device (e. g. an industrial PC) connected to the line. It is possible to send commands to change the controller settings or to simply ask information on the controller status. Following is the complete list of commands available: 30 31 Command CAR GET K 01 K 02 KCD KCF KCL KDS KDW KRG KST KUP MDR ECR TDR Parameter null NN null null null null null null null null null null null null null Description Request calibration data Request setup item NN Same as CFM+ +CAL keys Same as LCD+CAL+SETUP keys Same as CAL DATA key Same as CFM key Same as CAL key Same as LCD key Same as Same as key key Note If the controller is not in control or idle mode and the temperature reading is requested through the TMR command, the controller answers with the last acquired reading when it was in control or idle mode. After a recognized PWD command is received, the controller allows a maximum of 1 minute without receiving data, after which it locks again and a new PWD command is needed to perform password protected operations. Following are examples of commands for setup items: 1) "03 SET 22-01200<CR>" This command sets the setup item 22 (relay 2 setpoint) of a EC controller, identified by the process ID number 03, to the +12. 00 mS value. 2) "01 SET 33+005 <CR>" This command sets the setup item 33 (max. relay ON time) of a controller, identified by the process ID number 01, to 5 minutes. The " " character means blank. Once the controller has received a command, it answers with its 2-digit process ID number followed by: · ACK (Hex 06) If the controller recognizes the received command and performs the requested task; · STX (Hex 02) , Data , ETX (Hex 03) If the received command is a request of data; · NAK (Hex 15) If the received command is not recognized (e. g. the syntax is wrong); · CAN (Hex 18) If the controller cannot answer the request (e. g. the password was not sent, the controller is in setup mode, the setup item is not available in that model, etc. ) Note Same as SETUP key Same as key Request firmware code Request EC reading (in control or idle mode only) Request TDS reading (HI 710 models only, available in control or idle mode only) Request measure Range (in control or idle mode only) Request temperature reading Send the 4-digit password RNG TMR PWD SET null null NNNN NNPC1C2C3C4C5 Set setup item NN to the PC1C2C3C4C5 value P=+ if value is greater than 0 P=- if value is less than 0 C1 can be 0 or 1 only C2C3C4C5 can be 0÷9 or blank (the command is not available if the controller is in setup mode) 32 33 Note The controller answers to the GET command with the same data format explained in the SET command. Following are examples of answers: 1) "03<STX>+01200<ETX>" The controller with process ID number 03 says that its current setpoint is +12. 00 mS. 2) "01<STX>UE71022225<ETX>" The controller with process ID number 01 says that it is a HI710222 model with firmware release 2. 5. The minum delay between the last received character and first character of the answer is 15 ms. When the controller answers to the ECR, TDR and TMR commands, the reading is sent as ASCII string followed by a character indicating the control and alarm status of the controller. This character can assume the following values: · "A", control and alarm are ON; · "B", control and alarm are ON, and need update controller setup (GET commands); · "C", control is ON and alarm is OFF; · "D", control is ON and alarm is OFF, and need update controller setup (GET commands); · "N", control and alarm are OFF; · "M", control and alarm are OFF, and need update controller setup (GET commands); For example, a possible answer to the TMR command is: "03<STX>10. 7C<ETX>" meaning that the current temperature reading is 10. 7°C, the control action is active, no alarm condition is present and controller setup is updated on PC. "03<STX>10. 7D<ETX>" meaning that the current temperature reading is 10. 7°C, the control action is active, no alarm condition is present and controller setup is modified (must update controller setup for PC - GET command for setup items). [. . . ] If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization number from the Customer Service department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. CE DECLARATION OF CONFORMITY Recommendations for Users Before using these products, make sure that they are entirely suitable for the environment in which they are used. Operation of these instruments in residential areas could cause unacceptable interferences to radio and TV equipment. [. . . ]

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