D-MAX DMC-20SEC Manual de usuario descargar pdf (Pagina 18)

Macro Sensors Tel. (856) 662-8000

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

www.macrosensors.com

Multiple Write

The multiple write feature of the DMC-A2 meter allows multiple

registers to be written to in a single ASCII command string. It is

similar to a normal write command but with the following

differences:

• After the first data value, a separator character is inserted

instead of the message terminator. The next register address is

then specified, followed by another separator character and the

next data value. This procedure is repeated for each new

value in the string.

• Any number of registers can be written to using the multiple write

feature, as long as the total length of the command string does

not exceed 73 ASCII characters, including spaces and the

message terminator.

Figure 8 shows two examples of the multiple write command.

Start

Character

Meter

Address

Read/Write

Command

Address

Separator

Character

Data

Value

Message

Terminator

SW6,10000,7,20000,8,30000$

Start

Character

Meter

Address

Read/Write

Command

Address

Separator

Character

Data

Value

Message

Terminator

Start

Character

Meter

Address

Read/Write

Command

Address

Separator

Character

Data

Value

Message

Terminator

S6wL -32766 M 32766*

Figure 8 – Examples of Multiple Write Command

Serial Communications (cont.)

Note:

The multiple write feature cannot be used with special

ASCII registers (H to X).

Special ASCII Registers

DMC-A2 Series meters can have 6-digit displays using 15-

segment display LEDs. Table 5 shows which characters can be

used with a 15-segment display LED along with the associated

ASCII value.

Registers H to W – Display Customizing

Text can be customized on the following text displays to suit a

particular application:

• Register H – Text display for peak.

• Register I – Text display for valley.

• Register J – Text display for total.

• Register K – Text display for sub-total.

• Register L – Text display for setpoint 1.

• Register M – Text display for setpoint 2.

• Register N – Text display for setpoint 3.

• Register O – Text display for setpoint 4.

• Register P – Text display for setpoint 5.

• Register Q – Text display for setpoint 6.

• Register R – Text display for overrange.

• Register S – Text display for underrange.

• Register T – Text display for channel 1.

• Register U – Text display for channel 2.

• Register V – Text display for channel 3.

• Register W – Text display for channel 4.

The text string displayed by the meter can be 6 ASCII characters

long.

If a text string is read in the usual manner. For example, SRT$,

where:

• S for the start character.

• R for the read character.

• T for the text display for Channel 1.

• $ for the message terminator.

The meter responds by displaying the stored string: CH_1.

To customize the text string of the text display for Channel 1,

from CH_1 to Hello, issue the following command:

SWT Hello$

When the text display for Channel 1 is displayed on the meter,

instead of CH_1 being displayed, Hello is now displayed.

The print mode allows the meter to print data from any meter

imported into a spreadsheet.

and data stored in specific registers to be printed out when a

print command is issued by the meter while in the print mode.

Through the serial port, register X can be either written to or

read from using a terminal program on a PC.

Writing To Register X

Writing to register X tells the meter to print the data stored in one

or more of the meter's registers when the print command is

issued. To get the meter to print, the printer must be connected

to the meter through the serial port and the meter must be

programmed to [XX3] in Code 3.The data to be printed depends

on how the meter has been programmed, for example, to display

a flow rate and total.

The total length of a write string can be up to 30 ASCII

characters long

See Printing Restrictions below.

Reading From Register X

Reading from register X allows you to check your settings prior

to removing the PC from the serial port and connecting to a

printer. Register X can be read in the normal manner (i.e.

SRX$).

Example of Writing To Register X

The following example shows a write to register X with the meter

set to display flow rate and total flow of channel 1 in Code 2.

swx Rate = ~2 (add carriage return and line feed)

Total = ~16$

The above write to register X means the following:

swx: Start writing to register X.

Rate =: Tells the meter to print the word Rate =.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 27 28

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D-MAX DMC-20SEC Manual de usuario Pagina 18

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