Bus Installation; Rack Bus & Modbus (Rs485 Output); Sakura V1 Serial Pulse Ouput - Endress+Hauser Proservo NMS 5 series Technical Information

Modbus (RS485 Output)

Sakura V1 Serial Pulse Ouput

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Bus Installation

The initial bus voltage is provided by the PC plug-in board or the interface adapter. If an adapter is being used,
then the bus plug must be configured accordingly.
Termination Resistors
It is not necessary to set any termination resistors.
Bus Address
Each transmitter has an individual bus address. Depending on the type of transmitter, this is either defined by
the address switches or by the software of the transmitter itself.
Linking to a Personal Computer
A personal computer is connected using either a RS 485 PC board or an RS 232C / RS 485 external converter
(both with electrical isolation).
Bus Cabling
The bus cabling is galvanically isolated from the transmitter and the PC plug-in board or the interface adapter.
The screening must be grounded and have electrical continuity throughout.
EMC tests indicate the best result when the grounding at both ends and each transmitter is established. If there
is a potential difference in between the grounds,
measurement must be taken to equalize whilst observing a relevant hazardous area.
Bus Topology
When planning the system, attention should be paid to the possible segmentation of the bus according to indi-
vidual plant sections. Suitable topologies are:
• Serial, max. 1200 m
• Tree of total length 1200 m
The bus screening is to be connected at various points.
The bus is connected to a NRM, NRS, RTU8, MDP-III interface, Tankvision or to a receiver. The interface or
receiver must be configured accordingly.
Termination Resistors
It is not necessary to set any termination resistors for serial pulse output.
Bus Address
Each transmitter on a signal loop has an individual bus address. This is defined within the transmitter software.
Bus Cabling
The bus cabling is electrically isolated from the transmitter and from the interface receiver.
Standard communication cable (non-shielded twisted pair cable) can be used for the data transmission.
Bus Topology
The suitable topologies for the serial pulse output are:
Serial max. 6000 m (Sakura V1)
Tree of total length 6000 m. (Sakura V1)
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