Owner's manual

IM 01R04B08-00E-E 1st edition February 15, 2012 -00

<4. GETTING STARTED>

4-1

4. GETTING STARTED

MODBUSisdigitalcommunicationprotocolanddiffersinoperationfrom4to20mAtransmissionand

theHARTcommunication.ItisrecommendedthatusersuseMODBUSdevicesinaccordancewiththe

proceduresdescribedinthissection.TheproceduresassumethatMODBUSdeviceswillbesetupona

bench of an instrument shop.

4.1 Wiring in ROTAMASS 3 Terminal Box

Figure 4.1 I/O-Terminal Overview

Wiring:

•Conrm one ferrite core is attached to the owmeter.

•Insert the power cable into the ferrite core before connecting to the terminals. Fix the ferrite core to the

cable with clamping wire.

• Connect the power cables to the terminals according to the gures below.

• Connect the MODBUS- cables to the terminals according to the gure below.

•FortheconnectionofprotectivegroundconductortoPEterminalofRCCF31/RCCT3useacrimp-on

ringtypeterminal.ForRCCR31connecttheprotectivegroundconductortoPEterminalofterminal 

board.

The maximum length of MODUS cable depends on different inuences. Please see the MODBUS-

specication.

Pulse / Status output 2 (Sout )

Status input (Sin)

Pulse / Status output 1 (Pout)

MODBUS (RS485) -

MODBUS (RS485) +

Analog output 1 (Iout 1)

+ HART communication

F31.EPS

Sout -

Sout +

Sin -

Sin +

Pout -

Pout +

RS485 A

RS485 B

Iout1 -

Iout1 +

NOTE