ABB LD 800HSE, Manual

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Section 2 Hardware Installation Interfaces
3BDD011677-600 A 29
The maximum cable length is 3 m according to EMC requirements.
The baud rate is pre-configured to 115.2 kbit/s.
When using two linking devices as a redundant set, the serial interfaces of both
linking devices must be connected by a null modem cable (Article No:
3BDH000281R1), thus forming a “redundancy link”. If the redundancy link is not
installed during start-up (power-on), the linking devices will operate in non-
redundant mode.
10/100 Mbit/s Ethernet Port (HSE High Speed Ethernet Port)
The Ethernet port corresponds to the standards IEEE 802.3 100BASE-TX/10BASE-
T and supports auto negotiation.
The pin assignment corresponds to MDI (Medium Dependent Interface).
Table 2. Pin assignment of the serial interface
Pin Signal
1 CD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
Table 3. Pin assignment of the 10/100 Mbit/s port
Pin MDI Signal
1 TD+
2 TD-