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V2426A-C2-W7E
Руководство по аппаратной части Страница: 24

Moxa V2426A-C2-W7E [24/88] Checking the current serial settings

Moxa V2426A-C2-T [24/88] Checking the current serial settings

V2400A Series Expansion Modules Software Installation and Programming Guide

4-4

root@Moxa:~# setinterface

Usage: setinterface device-node [interface-no]

device-node - /dev/ttyM*

interface-no - following:

none - to view now setting

0 - set to RS232 interface

1 - set to RS485-2WIRES interface

2 - set to RS422 interface

3 - set to RS485-4WIRES interface

root@Moxa:~#

Checking the Current Serial Settings

To check the current interface setting, type the following. The system should display a response as below.

root@Moxa: ~# setinterface /dev/ttyM0

Now setting is RS485-2WIRES interface.

In the example above, port 1 on card 1 is configured as a 2-wire RS-485 interface. After entering the lines of

code below, port 1 gets reset as an RS-422 interface.

root@Moxa: ~# setinterface /dev/ttyM0 2

root@Moxa: ~# setinterface /dev/ttyM0

Now setting is RS422 interface.

ATTENTION

Seria

l interfaces will shift device node identifiers depending upon the location and number of cards

mounted in the platform

. E.g.,

if there are originally two cards mounted in the machine, and card number 1 is

removed, then the second card’s

node identifier will change from /dev/ttyM8 and /dev/ttyM9 to

/dev/ttyM

0 and /dev/ttyM1.

you

want to configure the machine for fixed serial interface device node identifiers, you can create a UDEV

rule in

/etc/udev/rules.d/. For help with this, consult the UDEV manual fi

les, another Linux manual, or Moxa

technical support for more details.

The system default for EPM-3032 interfaces is RS-232. By editing the device manager’s rule scripts, it is

possible to set all serial ports to one of the serial protocols (RS-485 or RS-422) instead. The steps below

describe how to do so.

1. Edit Moxa’s custom rules file for the device manager, which can be found at

/etc/udev/rules.d/96-moxa.rules. Add the following command to 96-moxa.rules:

# Set the device, EPM-3032, 0x1393:0x1022 default as 232 mode interface

DRIVERS=="mxser", ATTRS{vendor}=="0x1393", ATTRS{device}=="0x1022",

RUN+="/bin/setinterface /dev/ttyM%n 0"

"96-moxa.rules"

ATTENTION

The

VendorID for the EPM-3032 is 0x1393m, and the DeviceID is 0x1022.

Moxa V2426A-C2-W7E [24/88] Checking the current serial settings

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