D-MAX DMC-20SEC Manual de usuario descargar pdf (Pagina 20)

Macro Sensors Tel. (856) 662-8000

11 May, 2006 DMC-A2 Series (ALD-00029)

www.macrosensors.com

Serial Communications (cont.)

Up to seven different registers can be specified in one text

string, provided that the total string length is no greater than 30

bytes long and the total length of the resulting printout is less

than 100 bytes long (including time stamp if selected).

For example, the following tab delimited output could be

specified to input display data, processed result, processed

channel 1, processed channel 2, peak, valley, and total, directly

into a spreadsheet:

swx~2(tab)~3(tab)~4(tab)~5(tab)~12(tab)~13(tab)~p$

When calculating the length of the printout, an allowance of 7

bytes for each register address should be used, plus any extra

text or separating characters such as tabs or spaces.

Note:

As a new line is usually represented by a carriage

return and a line feed, two bytes should be added for each

new line in text string length calculations.

Serial Output Module Settings

Setting the 1st digit to 2 and the 2nd digit to 0 [CAL] [20X]

accesses the serial communications output module properties:

baud rate, parity, transmit time delay, and address settings.

Baud Rate

The baud rate range is selectable from 600 to 38400 baud. The

default baud rate is 9600.

• 600.

• 1200.

• 2400.

• 4800.

Parity

The default parity setting is [oFF]. Parity [odd] or [EVEn] can

also be selected.

Transmit Time Delay

The transmit time delay restricts the meter from transmitting

a reply to a slow or busy master device (PC, PLC, etc.) by

providing time delays of 2, 20, 50, or 100 milliseconds for all

serial modes except ASCII (Code 3 set to XX0).

The ASCII Mode uses message terminating characters:

• * = 2 milliseconds.

• $ = 50 milliseconds.

Address

The default address setting is 1, but can be set to anywhere

between 1 and 255.

• 9600.

• 19200.

• 38400.

Serial Communications Hardware

Pinouts & Interconnections

RS-232 Interconnections

Hardware Requirements

The following hardware is required to set the meter up for

simple RS-232 communications (see Figure 9):

• DMC-A2 Series meter with RS-232 serial output module option

installed.

• RJ-11 to DB-25 interface connector (and possibly a DB-25 to

DB-9 interface connector depending on PC serial port).

• Standard 4-wire cable with male RJ-11 connectors (see Figure

10 and 11, and Tables 6 and 7 for a wiring diagram and pin

descriptions).

• PC running a terminal program.

Printing Restrictions

When printing, any alphanumeric ASCII character can be used

within the following restrictions:

• The $ and * characters are reserved for the terminating

character at the end of the string and cannot be used as part

of the text string.

• The total string length must be no greater than 30 bytes long.

This includes spaces, tabs, carriage returns, line feeds, and

the terminating character. There must be a separator space

between the register address X and the start of the string.

This separator space does not have to be included in text

string length calculations.

• Any number following a ~ character will be interpreted as a

will be printed out in this position.

• The ASCII character \ is treated as a special character in the

print string.When a \ is encountered, a * is printed in its place

(* is reserved as a terminating character and normally can

not appear anywhere in the text string). This allows the print

output of one meter to be connected to another meter that is

operating in the ASCII mode.

For example, if the print string reads:

swx sw3 ~5\ sw4 ~12\ sw6 ~2\$

The printer prints the following:

sw3 (current register value)* sw4 (current register

value)*

sw6 (current register value)*

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 26 27 28

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