Warner Electric CBPC-3590 - Manual (Page 15)

Warner Electric • 800-825-9050 P-291-1 • 819-0526 15
Remote Operation
Some of the unit’s CONTROL inputs are
effectively duplicated by serial commands, so it is
possible to implement a single or multiple unit
system with remote capability. Such a system can
be used for multiple machines. Keep in mind the
addressing requirements for multiple unit systems
previously discussed .
Two types of commands are available, LOCAL
and GLOBAL. LOCAL commands affect only the
unit that is currently addressed. GLOBAL com-
mands on the other hand affect all units regardless
of address. In this way it is possible to command
many units to begin control at the same point in
time. The table below lists the LOCAL and GLOBAL
commands that are supported .
Formats and Protocol
Character Format
The serial interface sends and receives
information by characters consisting of 10 bits. The
RS422A/485 interface requires a 0.2 V minimum
differential across the + and – terminals. A logic
high (mark) is a positive differential and a logic low
(space) is a negative differential .
Note: Connection to EIA-422/485 equipment that
uses the opposite polarity requires swapping the +
and – connections at the other equipment.
To control one CBPC-3590 in a bus oriented sys-
tem the host must first address it by sending an
ADDRESS COMMAND SEQUENCE. This is shown
below:
host: (ESC) A nnn (where nnn is the unit
number from 1 to 999)
This escape code sequence will suspend the
transmission from all units including the one that is
addressed. The addressed unit will respond to all
subsequent commands while the other units just
“listen” on their receive input and turn their transmit
output off .
To receive data from an addressed unit the host
sends it a command to resume transmission using
the RESUME control character, (CTRL Q).
If you wish to suspend data transmission you may
do so by using the SUSPEND control character,
(CTRL S) .
In some cases the host may want to send many
commands to a CBPC-3590 control without waiting
for responses . This may be done by first suspending
transmission (CTRL S) then by requesting a single
UPDATE .
host: (ESC) U
Setup Mode Operation
The SETUP mode may be entered directly from the
RUN mode by cursoring to the desired SETUP lines
(4 – 8) using the ‘D’ command character then
sending the ‘L’ command character which mimics
the KEY keypad key. This action will place the
control in the SETUP mode allowing the user to
change the data in lines 3 through 8 in the program
table . Refer to page 11 for a complete operational
description .
Preset setpoints are changed using the numeric,
RST/CLR and DOWN cursor keys. The SETUP mode
is exited by sending another ‘L’ command character
at which time the controls reverts back to the RUN
mode .
Local and Global Commands
Control
Commands Local Global Comments
Control (ESC) LO (ESC) GO Simulates Output
Output Control Input
Batch (ESC) LB (ESC) GB Resets Batch
Reset to zero
Counter (ESC) LR (ESC) GR Resets Counter
Reset to zero