Data Interface; Interface Protocol; Protective Conductor Monitoring - WIKA CTD9100-ZERO Mode D'emploi

3. Design and function

3.6 Data interface

The instruments are fitted with a serial RS-485
communication interface. Via this interface one can connect
to a PC, level converter or a network.
The software protocol used is a MODBUS-RTU protocol,
EN
which is used in many monitoring programs available on the
market.
The transmission rate (baud rate) is factory set to
9,600 baud. Upon request, other transmission rates are
possible.
The 5-pin panel socket has two pins, A and B, that you
connect to the corresponding connections on the PC, level
converter or network.
Fig. 4: Plan view of the 5-pin panel socket
To connect to a PC, the RS-485 signal must be externally
converted to a RS-232 or USB signal. The appropriate
converter, including drivers, is available as an option.
The computer records all operational data and allows
programming of all calibrator configuration parameters.
The minimum requirements for operation with a USB
converter are:
IBM compatible PC
■
Installed operating system, Microsoft
■
ME, 2000, XP (Home or Prof.) or 7
A USB interface (USB 1.1 or USB 2.0)
■
A network connection enables the connection of up to 32
calibrators/micro-baths on the same network.
To connect to a network, some factory settings are required.
For this, please contact the supplier or WIKA directly.
On access to the programming via the keypad
while the serial interface is communicating, the
message "buSy" appears on the display, and
therefore indicates that it is in an "occupied"
state.
10

3.7 Interface protocol

The interface protocol is available on request for delivery as a
specific additional document.

3.8 Protective conductor monitoring

The calibrator is fitted with a protective conductor monitor
to keep a check on the base isolation of the heater. The
monitoring unit works independently of the normal control
and switches off the heating power supply as soon as the
calibrator no longer has a connection to the protective
conductor system.
Once reconnected to the protective conductor system, the
monitoring unit automatically switches the power supply back
on to the heating circuit.
®
Windows® 98 SE,
WIKA operating instructions temperature dry well calibrator, model CTD9100-ZERO