Interface And Output - IKA MIDI MR 1 digital Mode D'emploi

Interface and output

The device can be connected to a PC and operated with
the laboratory software labworldsoft ® through the RS 232
interface (G, see Fig. 2) or USB interface (H, see Fig. 2).
Note: Please observe the system requirements as well as
the operating instruction and help section of the software.
USB interface:
The Universal Serial Bus (USB) is a serial bus for connecting the
device to the PC. Equipped with USB devices can be connected
to a PC during operation (hot plugging). Connected devices
and their properties are automatically recognized.
Use the USB interface in conjunction with labworldsoft
operation in "Remote" mode and also to update the firmware.
USB device drivers:
First, download the latest driver for IKA devices with USB
interface from:
http://www.ika.com/ika/lws/download/usb-driver.zip.
Install the driver by running the setup file. Then connect the
IKA device through the USB data cable to the PC.
The data communication is via a virtual COM port. Configu-
ration, command syntax and commands of the virtual COM
ports are as described in RS 232 interface.
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 ac-
cordance with DIN 66 259 Part 1.
- Transmission procedure: asynchronous character transmis-
sion 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.
Commands:
Commands Function
IN_NAME Input description name.
IN_SP_4 Reading the set rated value of rpm.
IN_PV_4 Reading the real value of rpm.
OUT_SP_4 n Setting the rated value of rpm to n.
OUT_SP_42@n Setting the WD safety speed with the echo of the set value
OUT_WD1@m Watchdog mode 1: When a WD1 event occurs, the stirring functions are shut down and message PC
1 is displayed. Set the watchdog time to m (20...1500) seconds, with echo of the watchdog time. This
instruction starts the watchdog function and must be sent within the set watchdog time.
- 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 device (Slave).
- The device sends only at the computer's request. Even
fault indications cannot be sent spontaneously from the
device to the computer (automation system).
® for
- Commands are transmitted in capital letters.
- Commands and parameters including successive param-
eters 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
0x20 hex 0x0d hex 0x20 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 rec-
ommendations of the NAMUR working party (NAMUR rec-
ommendations 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 commu-
nication between the device and the PC. With a suitable
terminal or communications programme these commands
can be transmitted directly to the device. The IKA software
package, Labworldsoft , provides a convenient tool for con-
®
trolling the device and collecting data under MS Windows,
and includes graphical entry features, for motor speed
ramps for example.
OUT_WD2@m Watchdog mode 2: When a WD2 event occurs, the speed set point will be set to the WD safety
set point speed. The PC 2 warning is displayed. The WD2 event can be reset with OUT_WD2@0-
resetting also blocks the watchdog function. Set the watchdog time to m (20...1500) seconds, with
echo of the watchdog time. This command starts the watchdog function and must be sent within
the set watchdog time.
RESET Switching off the device function.
START_4 Starting the device (remote) function
STATUS_4 Display of status:
10: Manual operation without fault
11: Automatic operation Start (without fault)
12: Automatic operation Stop (without fault)
Note: when disconnecting the RS 232 or USB cable while the device is running, the device stays in PC mode. To reset to
function without PC, switch the device off and on again.
PC 1.1 Cable:
This cable is required to connect RS 232 interface (G) to a PC.
1
6
2
7
3
8
4
9
5
1
RxD 2
TxD 3
4
GND 5
6
RTS 7
CTS 8
Fig. 4
9
USB 2.0 cable A - B:
This cable is required to connect USB interface (H) to a PC.
4 1
3 2
USB B
Fig. 5
14
< 0: error code:
- 1: error 1
- ... (see „Error codes" table)
5
9
4
8
3
7
2
6
1
1
2 RxD
3 TxD
PC
4
5 GND
6
7 RTS
8 CTS
9
1
2
3
4
USB A
15