Liquid Controls SP3850 - Manual (Page 9)

5
SP3850 Flow Computer
Operation of Serial Communication Port with
Printers
SP3850’s RS-232 channel supports a number of
operating modes. One of these modes is intended
to support operation with a printer in metering
applications requiring transaction printing, data
logging and/or printing of calibration and
maintenance reports.
For transaction printing, the user defines the items
to be included in the printed document. The user
can also select what initiates the transaction print
generated as part of the setup of the instrument.
The transaction document may be initiated via a
front panel key depression, a remote contact
closure, or upon completion of a batch.
In data logging, the user defines the items to be
included in each data log as a print list. The user
can also select when or how often he wishes a
data log to be made. This is done during the setup
of the instrument as either a time of day or as a
time interval between logging.
The system setup and maintenance report lists all
the instrument setup parameters and usage for the
current instrument configuration. In addition, the
Audit trail information is presented along with a
status report listing any observed malfunctions
which have not been corrected.
The user initiates the printing of this report at a
designated point in the menu by pressing the print
key on the front panel.
Operation of Serial Port with Modems (optional)
The SP3850 RS-232 channel supports a number
of operating modes. One of these modes is
intended to support operation with a modem in
remote metering applications.
An external modem is intentionally being used with
the SP3850. This permits use with the variety of
modem standards worldwide while avoiding the
specialized approvals required for equipment that
is deemed to fall under the category of
telecommunication equipment.
In the modem mode, the SP3850 is assumed to be
operating in a remote metering role. The SP3850
will support key items in the Hayes Compatible
“AT” Command Set. In this role, the SP3850 will
have the following special abilities:
0. Monitor the modem status as a task of the
system
1. Instruct the modem to answer an incoming call
ATA
2. Respond to the calling modem at the
programmed baud rate and protocol
3. Terminate the telephone connection in event
the connection is lost.
In addition, the SP3850 will be capable of initiating
a call to a designated telephone number in the
event of a metering malfunction.