Moxa TC-SW04-M12-4P-T [25/43] None to view now setting none to view now setting

Moxa TC-SW04-M12-8P [25/43] None to view now setting none to view now setting

TC-6000 Series Expansion Modules Software Installation and Programming Guide

4-5

Root formula: Inaccuracy =

 – /(  /)

(



)



The variables in this equation are described below:

TBR = The Target Baud Rate, i.e., any non-standard baudrate

Factor = 921,600/TBR (rounded down to the integer)

ENUM = 8 * (921600/Target baudrate - Factor) (Round up or down)

As an example, below we show you how to calculate the transmission inaccuracy at a target baudrate (TBR) of

500,000 bps:

Target (non-standard) Baud Rate = 500,000

Factor =

,

,

= 1.8, then round down to the nearest integer to get

ENUM = 8 

,

,

 1 = 6.7, round to the nearest integer to get

Inaccuracy =

500,000 – 921600/(1 + 7/8)



500,000



100

= 1.696 = 1.7%

This result indicates that for a device configured at the non-standard rate of 500,000 bps, the actual modulation

rate will deviate around 2% from the configured baudrate.

TC-SP04-DB44-T: Configuring Serial Port Modes

Use the setinterface command to retrieve the parameters of the serial port configuration. The usage is

$:~# setinterface [device node] [interface option]. The device node is the tty device to be

configured. For the serial ports, Moxa uses a proprietary driver whose device nodes are identified with the

marker M. Serial ports 1 to 4 on card 1 are referred to as ttyM0 to ttyM3, and ttyM4 to ttyM7 refer to ports

1 to 4 on the second card and so on. The interface option is a number between 0 and 3 that will determine

what serial interface should be configured for the port in question. For example:

$:~# setinterface /dev/ttyM0 0

sets the first serial port on the first card for RS-232 communications. Refer to the examples below for details.

Moxa:~# setinterface

Usage: setinterface device-node [interface-no]

device-node - /dev/ttyM0 ~ /dev/ttyM15

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

Moxa:~#

Checking Current Serial Settings

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

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.

Moxa: ~# setinterface /dev/ttyM0 2

Moxa: ~# setinterface /dev/ttyM0

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