ROHRBACK COSASCO SYSTEMS CORRATER 9020 Manual de usuario descargar pdf (Pagina 12)

Chapter 3

Transmitter Connections

The System connections to the transmitter are as follows:

Connector Color Pairs Description

A Black 0 VDC Supply

B Red

Pair

24 VDC Supply

C Green RS 485 - Tx+ (B)

D White or Black

Pair

RS 485 - Tx- (A)

When multiple transmitters are used on the same RS 485 line, each transmitter must be set to a

different electronic address. By the RS 485 standard, up to 32 transmitter/receivers may be used

on one RS 485 line. The maximum line length is 4000 feet (1200 meters). For lengths greater

than 4000 ft, a repeater must be used. For typical systems with more than 32 transmitters,

multiple communication ports are used on the corrosion computer with no more than 32

transmitters on any one com port.

The requirements of the standards for use of the Corrater transmitter under its explosion-proof

rating (flame-proof) call for the transmitter to grounded (earthed) or bonded to ground. When

the transmitter is connected directly to a probe, this bonding is accomplished through the probe

body. To ensure good bonding, an 14 to 18 swg grounding wire can be attached to the

transmitter at the grounding stud provided and connected to ground (earth)

Setting Addresses for RS 485 Multi-drop

The transmitters are delivered with addresses already set. This address is marked on the outside

of the transmitter as the I/N or Identification Number. These addresses can be used directly if

the system is less than 32 transmitters without making any changes. If it is an add-on to an

existing system, then the number may have to be changed, in order to avoid any address conflicts

with an existing transmitter on the same line. If there are more than 32 transmitters on the

system, then no more than 32 can be used on any one communication line.

The DIP switch for setting the address and other parameters is on the top circuit board of the

transmitter (see figure 6)

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ROHRBACK COSASCO SYSTEMS CORRATER 9020 Manual de usuario Pagina 12