Mains Connection - IKA RET control Betriebsanleitung

BNC-Connector (for pH-probe)

Mains connection

RS 232
9 Pin Connector
Serial RS 232 interface and USB
Configuration
The unit can be controlled from an external PC (using the
dedicated software labworldsoft) via the RS 232 C serial interface
fitted to the unit.
To increase safety when controlling the RET control from a PC,
enable the watchdog function for monitoring the continuous
serial data flow (see chapter "Watchdog function").
• The functions of the interface lines between laboratory instru-
ment and automation system are selected from the specified
signals of the EIA-standard RS 232 C, corresponding with DIN
66 020 Part 1. The allotment of the bushing can be taken from
illustration
• For the electrical properties of the interface lines and for the
allotment of the signal status, standard RS 232 C, corres-
ponding with DIN 66 259 Part 1 applies.
• Transmission method: Asynchronous signal transmission in
start-stop-operation.
• Mode of transmission: Fully Duplex
• Character format: Character imaging acc. to data format
DIN 66 022 for start-stop-operation. 1 start bit; 7 character bits;
1 parity bit [straight (even)]; 1 stop bit.
• Transmission speed: 9600 bit/s
• Data flow control: Hardware handshake RTS/CTS
RTS: (pin 7) LOW (positive tension)
RTS: (pin 7) HIGH (negative tension)
CTS: (pin 8) LOW (positive tension)
CTS: (pin 8) HIGH (negative tension)
• Access method: Data communication from laboratory
instrument to computer is only possible on demand of the
computer.
Connection PT 100 / PT 1000
3
5
4
2
1
3
5 4
2
/ computer may send
/ computer may not send
/ computer recipient
/ computer not recipient
Instruction syntax
Here applies the following:
• The instructions are generally sent from the processor (master)
to the laboratory instrument (slave).
• The laboratory instrument exclusively sends on demand of the
processor. Even error codes cannot be spontaneously communi-
cated from the laboratory instrument to the processor (automatic
system).
• The instructions are transmitted in capital letters.
• Instructions and parameters as well as subsequent parameters
are separated by at least one blank (Code: hex 0x20).
• Each individual instruction including parameters and data as well
as each reply are terminated with CR LF (Code: hex 0x0D and
0x0A) and have a maximum lenght of 80 characters.
• The decimal separator in a floating point number is the point
1
(Code: hex 0x2E).
The above statements largely correspond with the recommen-
dations of the NAMUR-Association. (NAMUR-recommendations for
the design of electric plug connections for the analog and digital
signal transmission to laboratory - MSR individual units. Rev. 1.1).
Overview of the NAMUR-Instructions
Abbreviations:
X,y = Numbering parameter (integer number)
m = Variable value, integer
n = Value of variable, floating point number
X = 1 PT 100 or PT 1000 medium temperature
X = 2 Heating plate temperature
X = 3 Heating plate - safety temperature
X = 4 Speed
X = 5 Viscosity trend
X = 7 PT 1000 heat transfer medium temperature
X = 8 PT temperature sensor – safety temperature
X = 50 PT 100 temperature sensor offset in K
X = 52 PT 1000 1 temperature sensor offset in K
X = 53 PT 1000 2 temperature sensor offset in K
X = 54 Error 5 response time in seconds (180 <= n <= 1200)
X = 55 Intermittent mode cycle time in seconds
X = 56 Intermittent mode, duration of interruption in seconds
(-3.0 <= n <=+3.0 )
(-3.0 <= n <=+3.0 )
(-3.0 <= n <=+3.0 )
(10 <= n <= 600)
( 5 <= n <= 60)
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