Monroe-electronics Electrostatic Fieldmeter - Static Monitor - model Manual do Utilizador descarregar pdf (Página 46)

Setup Station ID (continue from above):

Press Key Display(blinking) Display Description

Left IT Interface Type

Down Sn Station number

Right 001 Enter station ID

Enter

Setup RS-485 from ME177A software: Connect the 177A unit to the PC’s comport. On the main entries screen,

click on Get – Active Program. This leads to Program Setup screen. Click on [Hardware Config] button to go to

the System Setup Screen. Enter the Station ID, Select Serial Type and Terminator. Click the [Send & Exit]

RS-232 To RS-485 Converters:

When connecting to the PC’s comport, an RS-232 to RS-485 converter may be needed (see Diagram above).

When connecting to the PC’s USB port, an USB to RS-485 converter is needed (see Diagram above). The

following device has been tested to use with 177A: VScom USB-COMi Adapter.

Connection to the 177A: Locate the DB-9 connecter on the back of the unit, connect the two wires to the 485

data as follows:

RS-485Bus 177A DB-9

Data+  Pin3

Data-  Pin2

For correct operation of the transmitter and the receiver, a return signal path between the grounding of individual

devices is required. It may be realized either by a third wire, or by grounding each device (third pole in the mains

socket).

Cable Selection For RS-485 Systems

Category 5 cable is available as shielded twisted pair (STP) as well as unshielded twisted pair (UTP) and

generally exceeds the recommendations for RS-422 making it an excellent choice for RS-485 systems

Setup for the Station ID and Terminator is the same as setup RS-485 Half, see above for details.

RS-485 Full Duplex (RS-422)

Termination enables

Up to 4000 feet

Pin1 9 2 3

177A

Unit 1

R+

R-

T+

T-

R+

R-

T+

T-

RS-232 or USB

to RS-485

Converter

Pin1 9 2 3

177A

Unit 2

Pin1 9 2 3

177A

Unit n

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 95 96

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