IKA MATRIX DELTA PLUS Manual page 16

/// RS 232 interface
Configuration:
› The functions of the interface connections between the device and the automation system are
chosen from the signals specified in EIA standard RS 232 in accordance with DIN 66 020 Part 1�
› For the electrical characteristics of the interface and the allocation of signal status, standard RS
232 applies in accordance with DIN 66 259 Part 1�
› Transmission procedure: asynchronous character transmission in start-stop mode�
› Type of transmission: full duplex�
› Character format: character representation in accordance with data format in DIN 66 022 for
start-stop mode� 1 start bit; 7 character bits; 1 parity bit (even); 1 stop bit�
› Transmission speed: 9600 bit/s�
› Data flow control: none
› Access procedure: data transfer from the device to the computer takes place only at the
computer's request�
/// Command syntax and format
The following applies to the command set:
› Commands are generally sent from the computer (Master) to the lab device (Slave)�
› The lab device only sends at the computer's request� Even fault indications cannot be sent
spontaneously from the lab device to the computer (automation system)�
› Commands are transmitted in capital letters�
› Commands and parameters including successive parameters are separated by at least one
space (Code: hex 0x20)�
› Each individual command (incl� parameters and data) and each response are terminated
with Blank CR LF (Code: hex 0x0d hex 0x0A) and have a maximum length of 80 characters�
› The decimal separator in a number is a dot (Code: hex 0x2E)�
The above details correspond as far as possible to the recommendations of the NAMUR
working party (NAMUR recommendations for the design of electrical plug connections for
analogue and digital signal transmission on individual items of laboratory control equipment,
rev� 1�1)�
The NAMUR commands and the additional specific IKA commands serve only as low level
commands for communication between the device and the PC� With a suitable terminal or
communications program these commands can be transmitted directly to the device� The IKA
software labworldsoft ® , provides a convenient tool for controlling the device and collecting
data under MS Windows, and includes graphical entry features, for motor speed ramps for
example�
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Commands Function
IN_PV 2 Read the actual temperature
IN_SP_2 Rerad the set temperature
OUT_SP_2 xxx Set the temperature value to xxx
OUT_SP_12@n Set the WD-safety temperature with echo of the set (defined) value
OUT_WD1@n Start the watchdog mode 1 and set the time for the watchdog to n (20���1500)
seconds�
Echo of the Watchdog time�
During a WD1-event, the tempering functions are switched off�
This command needs to be send within the watchdog time�
OUT_WD2@n Start the watchdog mode 2 and set the watchdog time to n (20���1500) seconds�
Echo of the watchdog time�
During a WD2-event, the set temperature is changed to the WD safety
temperature�
This command needs to be send within the watchdog time�
RESET Switch to normal operation mode
START_2 Start tempering function
STOP_2 Stop tempering function
IN_VERSION Read software version
IN_SOFTWARE_ID Read software ID and version
"Watchdog" functions, monitoring of the serial data flow:
If, once this function has been activated (see NAMUR commands), there is no retransmission
of the command from the computer within the set time ("watchdog time"), the tempering
functions are switched off in accordance with the set "watchdog" function or are changed to
the set target values�
The data transmission may be interrupted by, for example, a crash in the operating system, a
power failure in the PC or an issue with the connection table between the computer and the
device�
"Watchdog" – mode 1:
If there is an interruption in data communications (longer than the set watchdog time), the
tempering functions are switched off and Error 2 is displayed�
"Watchdog" – mode 2:
If there is an interruption in data communications (longer than the set watchdog time), the
temperature target value is changed to the WD safety temperature limit value� The error
message Error 2 is displayed�
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