Hardy HI 1756-nDF - Manual (Page 31)

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Chapter 4
First Word
– 0: Command Number
The default output table enables single parameters and functions to be modified.
The majority of the commands are intended to be used once and require a NOCMD or a
different command to be sent if the same command is to be repeated. However, there are
special function commands which can be repeated and each time the command is read the
appropriate action is taken. These special commands are denoted using a “**” in the
following table. For example the SET command enables the user to continually adjust the
target weight throughout a fill or dispense cycle.
The first word in the output table is a command, the possible commands are:
command Number description
NOCMD 0.0 No command
STARTANDTARE 1.0 This command causes an automatic TARE of the weigh
scale, sets the relays based on the mode of operation, and
calculates the two set points for relay RA and relay RB
before starting the fill cycle.
Relay Mode Description
0 Single Relay Mode
1 Sequential Relay Operation
2 Parallel Relay Operation
See “Overview of Relay Operation” for a detailed
description on the different modes of operation.
STARTNOTARE 2.0 This command sets the relays based on the mode of
operation and updates the two set points for both relay RA
and relay RB before continuing to run fill cycle.
The RESTART command does not cause an automatic
TARE of the weigh scale.
Relay Mode Description
0 Single Relay Mode
1 Sequential Relay Operation
2 Parallel Relay Operation
See “Overview of Relay Operation” for a detailed
description on the different modes of operation.
SET** 3.0 The SET command updates the two set points for relay
RA and relay RB while continuing to run the fill cycle.
The SET command does not cause an automatic TARE of
the weigh scale and does not set the relays based on the
mode of operation. This is used to change the target and
preact values only.
** Repeatable Command
STOP 4.0 The relays are set to their default OPEN state, and the unit
continues to monitor the weight readings but ignores
weight readings to ensure relays remain OPEN.