Serial Interface Rs232 / Rs485 (Switchable) - Sensor Therm METIS M3F1 User Manual

Serial Interface RS232 / RS485 (switchable)

4.1.4
The serial interface is used for digital communication of the pyrometer with another computer, for exam-
ple a PC for data transmission to the software SensorTools. Via interface always all temperatures are
transferred (2-color and one channel temperatures) as well as device information and parameters.
The maximum transmission speed (in Baud) is limited by the cable length, it is halved with each dou-
bling of the transmission path.
 RS232: about 7 m cable length with 19.2 kBd. Adjustable are values from 4.8 to 115.2 kBd.
 RS485: about 2 km with 19.2 kBd. Adjustable are values from 4.8 to 921.6 kBd.
Connecting one pyrometer via
RS232 or RS485:
In a short RS232 or RS485 connection to the mas-
ter (computer receiving the data), the pyrometer is
connected directly as a point-to-point connection
with the master.
It is advantageous to connect all interface cables
in order to avoid reflections.
Connecting several pyrometers via RS485:
For a reflection-free operation with longer cables, pay attention to the correct cable termination. Termi-
nation at the physical bus is on front and rear.
Master at the
beginning:
Master in the
middle:
When operating multiple devices (up to 32 are possible), each device needs to assign its own address
(directly on the device or via software SensorTools), under which it can be addressed later. For this
purpose, initially, each device must be connected individually and provided with an address (00-97). Af-
ter that, all devices can be connected.
If specific parameters for all devices should be changed simultaneously, the global address 98 is used
(there is no response from the device). If the address of a device is unknown, you have the opportunity
to address each device independently of the set address with the global address 99 (connect only one
device).
10
A (-) A
B (+) B
DGND GND
Master
Terminating
resistor 120 Ω
in the master
or manually
Pyrometer 1
A A
B B
GND
Terminating
resistor 120 Ω
Pyrometer 1
RxD
Pin 2
TxD
Pin 3
Pin 5
GND
RS232 (PC)
A (-)
RS485
B (+)
(Master /
PC)
GND
A A
B B
GND GND GND
Pyrometer 2
A (-)
B (+)
DGND
Master
METIS M3F1
Electrical Connection
TxD Violet
TxD Red-blue
RxD Black
RxD Grey-pink
DGND Red
A (-) Violet
A (-) Red-blue
B (+) Black
B (+) Grey-pink
DGND Red
A A
B B
GND
... Pyrometer n
A
B
GND
... Pyrometer n
Pyrometer
Pyrometer
A
B
Terminating
resistor 120 Ω
A
B
Terminating
resistor 120 Ω