HMS Anybus CompactCom B40 Modbus Serial User Manual page 26

Hardware Design
4.2.2 Power Supply Pins
Signal Name
GND
3V3
4.2.3 How to Connect Unused Network Connector Pins
For Ethernet versions of the Anybus CompactCom B40 Modbus Serial it is recommended to
terminate Ethernet signals in the network interface if one of the Ethernet ports is unused. For
the 10/100 Mb/s hardware version it is sufficient to terminate pair no. 1 and 2, for the port of
concern, while for the 1 Gb/s hardware version this has to be done for pair no. 1, 2, 3, and 4.
Fig. 11
Unused fibre optic connector pins should be connected as follows:
• 100R between TXP and TXN
• 820R between SDN and 3V3, resulting in 2 V on SDN
• 1k5 between SDP and 3V3, resulting in 1.5 V on SDP- Indicates that no signal is received. A
signal amplitude of 0.5 V is appropriate.
• 4k7 between SCL and 3V3
• 4k7 between SDA and 3V3
Other network signals may be left floating when not used.
Anybus ® CompactCom ™ B40 Modbus Serial User Manual
Type
Pin No. Description
Power 2, 6, 10,
Ground
14, 18, 28,
Power and signal ground reference.
32, 36, 40,
44, 52
Power 1, 27, 51
3.3 V power supply.
24 (48)
SCM-1202-130 1.1 en-US