Laurel Electronics Custom ASCII Protocol For Laureate Series 2 Digital Panel Meters, Counters, Timers & L-Series Transmitters User Manual
Page 17
17
The Counter and Scale Meter are capable of supplying more than 1 measurement value (or
“Item”) with each reading, as selected in “Ser 3”. In the counter, there can be up to 3 Items
plus Peak and Valley values, depending on the selected Function. The scale meter can transmit
Net, Gross and Peak weight.
Values are transmitted in a continuous string with no space between them. If the 5
th
digit in
“Ser 3” is set to 1, the termination characters of
value. If the 5
th
digit is et to 0, the termination characters appear only once at the end of the
string. In either case, if included, the coded character appears at the end of the last value only.
7.3 NETWORK CONFIGURATIONS
The meters and transmitters can operate in a point-to-point mode using RS-232 or RS-485, or
in a multi-point mode using RS-485.
The point-to-point mode is a direct connection between a computer (or other digital device)
and the meter or transmitter.
The multi-point mode is a connection from a host computer to a multiplicity of meters or
transmitters bused together with their inputs and outputs connected in parallel. For long cable
runs, the first and last devices should have a termination resistor installed. It is necessary to set
up each device on the bus with a different address from 1 to 31. To command a particular
device, its address is used in conjunction with the command, and only that device responds.
The outputs of all of the devices on the bus are set to a high impedance state, except the device
being addressed. The device addresses range from 1 to 31. A special address to which all
meters respond is 0 and should not be used in the multi-point mode. Addressing of meters can
be set in “Ser 2”.
A device 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.
7.4 OPERATING MODES
The meters and transmitters can operate in a Continuous Mode or a Command Mode.
In the Continuous Mode, measurements are continuously transmitted by the meter in a
standard data format. Please see the next manual section.
In the Command Mode, the meter does not send any data automatically, but responds to com-
mands received from a host computer. Please see the manual section following the Continuous
Mode.