Laurel-electronics LAUREATE SERIES Serial Comunications Manuel d'utilisateur télécharger pdf (Page 11)

4.0 SYSTEM CONFIGURATIONS

The meters operate in a Point-to-point mode using RS-232 or RS-485. In addition, they can

operate in a Multi-point mode using RS-485.

Point-to-point mode is a direct connection between a computer or other digital device and the

meter.

Multi-Point mode is a connection from a host computer to a multiplicity of meters bussed together

with their inputs and outputs connected in parallel. For long cable runs, the last meter should have

the termination resistors installed. It is necessary to set up each meter on the bus with a different

address from 1 to 31. To command a particular meter, its address is used in conjunction with the

command and only that meter responds. The outputs of all of the meters on the bus are set to a

high impedance state except the meter addressed. The meter addresses range from 1 to 31 with

0 being a special address to which a meter responds only internally (e.g. Reset) but does not

transmit any response on the output lines. All meters may be commanded simultaneously with

a 0 address and there will not be any output response contention. Addressing of the meters can

be set in “Ser 2”,

A meter operating in a point-to-point mode must also be addressed. Although any address will

suffice, it is suggested address = 1 be selected as a standard for the point-to-point mode.

5.0 OPERATING MODES

5.1 CONTINUOUS MODE

In this mode, measurements are continuously transmitted by the meter in a standard data format

using printable ASCII characters and at a selectable rate extending from the line frequency down

to one measurement every 72 seconds. This data may be received by a remote display at a distant

location, or by a printer for data logging purposes, or by a host computer for data analysis or system

control.

DPM and Scale meter only

The transmission rate of measurement data can be selected in “Ser 1”. The meter conversion

rate equals AC power frequency (50 or 60 Hz). Any baud rate may be used but if less than the

minimum baud rate in the table, the transmission rate will decrease accordingly.

Output rate

Minimum Baud rateData Output Rate

-10-

1 Item sent

9600

600

300

2 Items sent

9600

600 / 1200

300 /600

300

3 Items sent

19200

1200

600

300

50 Hz / 60 Hz

.021s / .018 s

.34 s / .28 s

.68 s /.57 s

1.4 s / 1.1 s

2.7 s / 2.3 s

5.4 s / 4.5 s

1.9 s / 9.1 s

21.8 s / 18.1 s

43.5 s / 36.3 s

86.7s / 72.3 s

Ser 1 setting

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 39 40

THE LAUREATE SERIES 1

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Laurel-electronics LAUREATE SERIES Serial Comunications Manuel d'utilisateur Page 11

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