Model 574 Programmable Counting System (PCS)
284 - GSE Scale Systems
550 indicators to be cascaded together allowing specific
information to be directed to individual units. The Address
Control Character should follow the Start Control
Character in the data stream from the sending device.
Remote key operation will not work when cascading
indicators. This means that pressing a key on any of the
units will not have any direct effect on the master unit.
Note that parameters P280 thru P287 must be disabled.
These parameters allow for individually disabling the front
panel keys from sending out serial commands to remotely
effect the master unit. In the case of cascading units, these
serial commands would be sent to the adjacent unit which
might not be desirable. Disabling all remote key
parameters will eliminate one 450 or 550 from sending any
remote key commands to any adjacent unit in the link.
Received Format:
<START CONTROL CHARACTER>
<ADDRESS CONTROL CHARACTER>
<NUMERIC DATA> < SPACE> <UNITS> <SPACE>
<DATA NAME> <END CONTROL CHARACTER>
Format example:
<STX> <ESC> <534.03> < > <lb> < > <Gross> <CR>
Cascading Connections:
Remote display operations generally require no handshake
lines. A transmit line and a ground line are sufficient. This
will make cascading 450 units easier.
Connect the (TX) line from the sending device to the (RX)
connection on the 450 COMM Port (J6) 550 COMM Port
(J2). Connect the ground line from the sending device to
the ground connection on the 450 COMM Port (J6) 550
COMM Port (J2). Any of the two ground connections can
be used on the 450 (J6) connector.
The next cascaded 450 should be connected from the
previous 450 or 550’s (TX) connection to its (RX)
connection. The ground line should be connected between
the two units. Refer to figure 49 for cascading connections.
Note that the master device in figure 49 is a 574. It could
very well be another GSE indicator such as a Model 550 or
570 with an operating macro program. The master device
could also be a computer with an operation program.
P274.X Start
This parameter allows for setting the Start Control
Character received from the master unit. The Start Control
Character is used for both the Display (echo from master)
and Text format modes. Press the <ENTER> key to scroll
through all selections. This selection must match the Start
Control Character selection set in the P290 parameters in
the master unit (P291) or the Start Control Character in the
custom transmit.
P275.X End
This parameter allows for setting the End Control
Character received from the master unit. The End Control
Character is used for both the Display (echo from master)
and Text format modes. Press the <ENTER> key to scroll
through all selections. This selection must match the End
Control Character selection set in the P290 parameters in
the master unit (P292) or the End Control Character in the
custom transmit.
32.6 Remote Keys
The 450 and 550 have the capability to echo serial
commands out their COMM Port associated with a specific
key press. This will allow the operator to remotely control
functions on the master unit. An example of this would be
to remotely zero the master unit (GSE M574). Pressing
<ZERO> on the 450 unit will transmit a serial command to
the 574 specific to performing a zero operation. Note that
bi-directional capabilities must be fully intact. The 550
units COMM receive input must be ON. A TX, RX and
GND cable must be connecting both units COMM Ports.
Both the master and remote unit must be setup for software
handshaking (Xon). This will allow the master unit (550)
to transmit its display information while allowing the slave
unit (450) to remotely send serial key commands. Refer to
figure 50 for Remote Key operation connections. Figure 48
illustrates standard Remote Display operation connections
without remote key operation. The master unit must be set
for NO handshaking.
The following parameters allow for disabling individual
remote keys (P280 thru P287).
P280.X ZERO
This parameter allows for enabling or disabling the remote
450 or 550’s <ZERO> key. If enabled it will have an
effect on the master unit. When this key is pressed it will
send a zero operation command recognized by another
GSE indicator. Both a TX, RX and GND line must be
connected between the two units COMM Ports for remote
key operation. Both units must be set for software
handshake (Xon). If this parameter is disabled the
<ZERO> key will have no effect on the master unit.
To Next Page
Loading...