FUTEK IPM500 (D500) Digital Display - Manual (Page 12)

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 a Peak value, 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 and optional appear after each
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.
6.3 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
instrument.
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 last device 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, 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 devices may be commanded simultaneously with a 0 address, and there will not be
any output response contention. 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.
6.4 OPERATING MODES
The meters and transmitters can operate in a Continuous Mode or 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.
7. CONTINUOUS MODE
7.1 OVERVIEW
In the Continuous Operating Mode, measurements are continuously transmitted by the meter
or transmitter in a standard data format using printable ASCII characters at a user-selectable
rate ranging from 50 or 60 Hz line frequency down to one measurement every 72 seconds. This
data may be received by a remote display at a distant location, by a printer for data logging
purposes, or by a host computer for data analysis or system control.
Both hardware (RTS) and software (XON/XOFF) handshaking are available for RS232, but
neither is available for RS485.
7.1 METERS OR TRANSMITTERS WITH DPM OR SCALE METER MAIN BOARD
The transmission rate of the measurement data can be selected in “Ser 1”. The meter
conversion rate equals the 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 Data Output Rate Minimum Baud Rate
“Ser 1” Setting 50 Hz / 60 Hz 1 Item Sent 2 Items Sent 3 Items Sent
0
1
2
3
4
5
6
7
8
9
021s / .018 s
.34 s / 0.28 s
.68 s / 0.57 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
9600
600
300
300
300
300
300
300
300
300
9600
600 / 1200
300 / 600
300
300
300
300
300
300
300
19200
1200
600
300
300
300
300
300
300
300
7.2 METERS OR TRANSMITTERS WITH COUNTER / TIMER MAIN BOARD
The transmission rate of the measurement data can be selected in “Ser 1". Data transmission is
initiated at the end of the calculation time following the gate time. Data is completely trans-
mitted for one measurement before the calculation of the next measurement is started.
Therefore, the reading rate is influenced by the baud rate, the number of items transmitted, and
gate time. If the selected gate time is less than that shown in the table below, it is not the
determining factor of the reading rate. If it is greater, then it is the determining factor. Time
intervals (reciprocal of rate) between transmissions at the reading rate are:
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