Hanna-instruments mV 602 Series Instrukcja Użytkownika Pobierz pdf (Strona 16)

3130

As additional feature, the controller is also

provided with two pins (5V and 0V) in or-

der to apply the Fail Safe Open Line

protection method. To avoid erroneous

readings in Open-Line conditions, pull-

up and pull-down resistors should be

connected as shown.

The Fail-Safe resistors are connected only to one unit in the

line, and their value depends on the application and char-

acteristic impedance of the connection cable.

The RS485 port is optoisolated from measuring circuit and

power line. If both analog output and RS485 port are present,

they 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.

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:

Command Parameter Description

CAR null Request calibration data

GET NN Request setup item NN

K01 null Same as CFM+ +CAL keys

K02 null Same as LCD+CAL+SETUP keys

KCD null Same as CAL DATA key

KCF null Same as CFM key

KCL null Same as CAL key

KDS null Same as LCD key

KDW null Same as  key

KRG null Same as  key

KST null Same as SETUP key

KUP null Same as  key

MDR null Request firmware code

MVR null Request mV reading

(mV602 only; available in

control or idle mode only)

PHR null Request pH reading

(pH502 only; available in

control or idle mode only)

PWD NNNN Send the 4-digit password

SET NNPC

Set setup item NN to the

value

P=+ if value is greater than 0

if value is less than 0

can be 0 or 1 only

can be 0÷9 or blank

(the command is not available if

the controller is in setup mode)

TMR null Request temperature reading

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 36 37

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