Liquid Controls SP4000 User Manual
Page 11
SP4000 Flow Computer
8
Consult the Universal Serial Commands User Manual for
details on the individual commands supported by the
SP4000. Contact the SPONSLER Flow Applications Group
for a discussion on the remote metering system capabilities
you are considering.
NOTE: Some modems can be configured in advance to
answer incoming calls, terminate phone connections if
communications is lost. In such applications there may be
no need for the SP4000 to be functioning to “control” the
modem. Setting the RS233 USAGE = COMPUTER will
likely work.
Operating Serial Communication Port with Two Way
Paging
The SP4000 offers a number of capabilities that facilitate
its use with two way paging systems. The SP4000’s RS232
port can be connected to a compatible two way pager
transceiver in order to implement a wireless, two way
paging, remote metering system. A compatible, industrial
Two Way Pager Transceiver accessory is offered in the
TWPNW specifically designed for use with the SP4000. A
monthly service contract with a two way paging provider,
for example Skytel, is required. The remote user or system
sends or receives information from the SP4000 using either
a Two Way Pager, such as Motorola’s Pagerwriter 2000
pager, or by email via the INTERNET.
In addition to obtaining remote meter readings, the serial
commands may also be used to examine and/or make
setup changes to the unit, and/or to check for proper
operation or investigate problems. Several hundred
commands are supported.
The SP4000 and TWPNW can be used together to create
systems with one or more of the following capabilities:
1.
Poll the SP4000 unit for information from a remote PC
over the Internet via email.
2.
Call Out from the SP4000 unit to a remote PC on a
scheduled reading time and/or crisis basis by email
and the internet
3.
Some combination of the above two descriptions where
the unit is polled by one PC and calls into to a different
PC or pager if a problem is detected.
In fact, up to five ST-2 units can share the same Two Way
Pager. Each SP4000 must have a unique DEVICE ID. This
multidropping of flow computers on a single Two Way
Pager is popular when there are several flow computers
mounted near each other.
The SP4000’s RS232 USAGE is first set equal to PAGER.
Each SP4000 on a shared PAGER is given a unique serial
device address or DEVICE ID. The BAUD RATE is
commonly set to 9600, the PARITY set to NONE, and the
HANSHAKING set to NONE to complete the basic setup.
In a simple system, the SP4000 will send an email to an
address programmed into the unit. The recipient will receive
a daily email report containing the information desired in
the form of a readable report.
To setup the information to be sent in this example:
Setup your desired PRINT LIST
Setup what will initiate the storage of information in
the PRINT INITIATE menu
Setup any related parameters: PRINT INTERVAL or
PRINT TIME
Set DATALOG ONLY
= YES if data records will
be sent at a later time
= NO if data records will be
sent immediately as well as
being stored
Set DATALOG FORMAT = PRINTER
To setup the communication channel, the following
communication menu settings would be used:
RS232 USAGE = PAGER
Set the DEVICE ID,
BAUD RATE= 9600,
PARITY= NONE,
HANDSHAKING=NONE
DEVICE MASTER = YES (When multidropping
several SP4000, only one unit will be the DEVICE
MASTER)
CALL OUT NUMBER =
CALL OUT TIME = time of a scheduled call out in
HH:MM format (if used set a different call
out time to each unit, several hours apart)
NUMBER OF REDIALS = 3 (if there is poor coverage
unit will try to up to 3 times)
PAGER PIN NUMBER = Number given you by Skytel > DESTINATION TYPE= E-MAIL (or PAGER PIN if pager or mailbox) MAX BLOCK SIZE = 3 (This is number of blocks (1- 4) of 128 bytes to be sent in each message. If you also wish the unit to CALL OUT in the event of a CALL ON ERROR = YES needs
A smaller number of blocks increases the
chance of successful communication
transfers.
problem, the following menu settings would be used:
ERROR MASK configured to suit the applications