Liquid Controls SP4000 - Manual (Page 34)

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SP4000 Flow Computer
5.8 RS-232 Serial Port Operation
The RS-232 serial port can be used for programming (using the Setup Disk) or for
communicating to printers and computers in the Operating Mode (Run Mode). Enhanced
uses include remote metering by modem or two way pager.
5.8.1 PC Communications:
The Setup Disk also allows the user to query the unit for operating status such as Flow
Rate, Flow Total, Temperature, Pressure, Alarm Setpoints, etc.
In this mode of operation the RS232 port is assumed connected to a
computer. The SP4000 will act as a slave and answer requests from the PC. See
the Universal Protocol Users Manual for a complete listing of the commands
set supported. A DDE/OPC Server is also available for use in exchanging
information with DDE Clients such as Spread Sheets, Database Programs, and
HMI software.
5.8.2 Operation of RS-232 Serial Port with Printers:
Transaction Printing
For transaction printing, the user defines the items to be included in the printed
document (see section 6.13 COMMUNICATION, Print List). The transaction document
can be initiated by pressing the PRINT key.
Data Logging
The user can select when (time of day) or how often (print interval) the data log is to be
made (see section 6.13 COMMUNICATION, Print Initiate). Information will be stored to
the datalogger and optionally output to the RS-232 port.
System Setup and Maintenance Report
The system setup and maintenance report lists all of the instrument setup parameters
and usage for the current instrument configuration. The audit trail information and a
status report is also printed. This report is initiated in the Service and Analysis Group
(see section 6.15 SERVICE & ANALYSIS, Print System Setup).
5.8.3 Operation of RS-232 Serial Port with Modems and Pagers
Modem
In this mode of operation the RS232 port is assumed to be connected to a telephone
modem. The SP4000 is responsible for communicating to a remote computer through the
modem to perform such actions as:
Answer incoming calls, process requests for information or action items or data log
contents or change setup parameters, call out daily readings to designed phone number,
call out to designated phone number in the case of a designated exception or malfunction
in the unit, terminating telephone calls if a connection is lost.
Two Way Paging
In this mode of operation the RS232 port is assumed to be connected to a Two Way Pager
Transceiver. The SP4000 is responsible for communicating to the pager to perform such
actions as:
Look for and process requests for information or change setup parameters, call out daily
readings to designed pager/email address, call out to designated pager/email address in
the case of a designated exception or malfunction in the unit.
5.9 RS-485 Serial Port Operation
The RS-485 serial port is intended to permit operation of the flow computer in a RS-485
network. Access is limited to reading process variables, totalizers, error logs and to
executing action routines such as clearing totalizers, alarms, and changing setpoints.
5.10 Pause Computations Prompt
The user will be prompted with a "Pause Computations" message when making significant
setup changes to the instrument. Pausing computations is necessary to make any
significant changes. With computations paused, all outputs assume a safe state equal
to that of an unpowered unit. Computations resume when exiting the setup menu.
RS-232 Serial Port
Operation
PC Communications
RS-232 Serial Port
Operation of RS-232 Serial
Port with Printers
Operation of RS-232 Serial
Port with Modems and
Pagers
RS-485 Serial Port
Operation
Pause Computations
Prompt