3
8
1
5
9
6
B_LINE
A_LINE
Page 15
MAC ADDRESS IN THE INSTRUMENTS WITH ETHERNET INDUSTRIAL FIELDBUS.
The instruments that mount Hilscher modules with Industrial Ethernet protocol (Profinet, EthernetIP, Ether-
cat, etc.) have a label under the connectors, as shown below.
This label shows the MAC Address of the module (red box), an identification number of the module
(blue box) and a QR code that contains the MAC Address. The latter can be read with a smartphone
using a QR reading app i.e., on the Google Play Store, “QR Code Reader”).
PROFIBUS CONNECTION
Pin
Signal
Description
3
B line
+RxD/+TxD, level RS485
4
RTS
Request to send
5
GND
Ground (insulated)
6
+ 5V Bus 5V end (insulated)
8
A line
-RxD/-TxD, level RS485
Housing Cable shield
Internally connected to the protective
ground according to Profibus
specifications
To connect to the Profibus MASTER, use a standard Profibus cable. The typical impedance of the cable
should be between 100 and 130 Ohm (f > 100 kHz). The cable capacity (measured between conductor
and conductor) should be less than 60 pF/meter and the minimum conductor cross-section should not
be less than 0.22 mm
2
.
In a Profibus-DP network, both type A and type B cables can be used, depending on the required per-
formance. The following table summarizes the characteristics of the cable to be used:
Feature
Type A cable
Type B cable
Impedance
135 to 165 ohm (f = 3÷20 MHz)
100 to 300 ohm (f >100 kHz)
Capacity
< 30 pF/m
< 60 pF/m
Resistor
< 110 ohm/km
-
Conductor section
> 0.34 mm
2
> 0.22 mm
2
The following table shows the maximum length of the line with type A cable and with type B cable
according to the different communication speeds required:
Baudrate (kbit/s)
9.6
19.2 187.5
500
1500 3000 6000 12000
Length (m) of the type A cable
1200 1200 1000
400
200
100
100
100
Length (m) of the type B cable
1200 1200
600
200
-
-
-
-
For reliable operation of the fieldbus, a line terminator should be used at both ends.
In case of multiple MCT 1302 instruments, use the line end only on an instrument.
For the setup of the board, the GSD file (hms_1810.gsd) is available and must be installed in the master.