Monroe-electronics Electrostatic Fieldmeter - Static Monitor - model Manuale Utente Scaricare il pdf (Pagina 45)

APPENDIX III

III.

RS-485 Half Duplex / Full (RS-422) Connection To 177A

RS-485 is a specialized interface that is very common in the data acquisition world. An RS-485 network can be

connected in a 2 or 4-wire mode (bi-directional - half duplex - multi-drop Communications over a single or dual

twisted pair cable). All the devices in the same network should be connected in daisy chain (see diagram below).

Maximum cable length can be as much as 4000 feet.

Tools and procedures to setup the 177A units for RS-485 communication:

 Station ID, RS-485 and Terminator setup.

 RS-232 to RS-485 Converter.

 Cable

Station ID, RS-485 and Terminator setup: Each 177A on the same RS-485 bus must have its own unique ID (1-

255). This can be set via ME177A software or from the front panel Setup. Baud rate is 9600 by default.

Setup RS-485 from the 177A front panel:

Press Key Display(blinking) Display Description

Setup Lo Front panel Lock

Up SS System Setup

Right bAu Baud rate

Down IT Interface Type

Right +232 RS-232

Down 485 - HAF RS-485 Half duplex

Enter

Setup Terminator (continue from above):

Press Key Display(blinking) Display Description

Left +485

Down TEr Terminator

Right on Press up/down to select terminator on / oFF

Enter

RS-485 Half Duplex

RS-232 or USB

to RS-485

Converter

Pin 2 3

177A

Unit 1

Termination enables

Up to 4000 feet

485 Data+

485 Data-

T+

R+

R-

T-

Pin 2 3

177A

Unit 2

Pin 2 3

177A

Unit n

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 95 96

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