Raveon RV-M7 Spécifications télécharger pdf (Page 17)

RV-M7 Technical Manual

Phoenix Contact/Tyco makes a convenient DB-9 to terminal-block connector, part number 2761839.

4.7 RS422/EIA-422 Serial I/O Connector

RS-422 communications uses 4-wire differential signals. The RS422 9-pin serial I/O connector is a female

9-p D-subminiature connector having the following pins configuration.

Front-view of DB-9 connector on modem (female)

Pin #

Name

Dir

Function

Level / Specification

Do not connect

Do not connect this pin to anything.

B (-)

Inverting RS-422 data in line

Out -

out

Inverting data out pin

A (+)

Non-inverting RS-422 data in line

GND

Ground

Connect to earth ground.

Do not connect

Do not connect this pin to anything.

Out +

out

No-inverting data out

Vin

In/Out

DC Power

DC Power in or out if unit is powered using DC

in jack.

Configuring for RS-422

To configure the M7 modem for RS-422 operation, use the ATIO 4 command. You must order the RS-

422 option for this to work. The M7’s hardware is identical to the RS-485 version, with the exception of

two internal loop-back resistors.

Raveon’s RS-422 I/O circuit uses 3.3V logic to drive the lines, and the RS422 pins are ESD protected to

±15kV and 7kV human body model.

RS-422 installations typically have a termination resistor across the In and the Out lines. A value of 150

ohms should work in most applications.

Bias and Termination Resistors

M7 transceivers with the RS-422 option have receivers with built-in bias resistors, offering the

network a true “1/8 unit load”. In most allocations, these internal bias resistors are sufficient, and

an external bias resistor is not required.

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