Appendix C
A-86
A.1 Hardware Requirements
The flowmeter can be configured with PolyLink using an IBM-compatible PC or a
DDF3088 flowmeter. The PC must be a minimum of an XT with 640K RAM. If a
DDF3088 is used, the flow program operating in the DDF3088 must be version 2.2 or
higher. The only other hardware requirement is a null modem cable.
The com port of the PC connects to the RS232 port of the flowmeter with a null modem
cable. The RS232 port of the flowmeter has a male DB9 or male DB25 connector,
depending on the flowmeter model. If the cable length is relatively short, a remote terminal
can connect directly to the flowmeter.
For extended distances, short haul modems must be used and are available with the
PlantCom Plus package (Section A.1.1). The short haul modems are supplied with their
own terminal blocks and wiring diagrams for connection to field wiring.
NOTE: If PolyLink is run from a DDF3088, one of the following is required:
!
The optional RS232 Com Cable (Rev. B) which is connected directly between
the DDF3088 and the flowmeter. (The RS232 Com Cable is a custom null
modem cable for use with the DDF3088.)
!
The optional charging rack which docks with the DDF3088. The charging rack
connects to the flowmeter with a null modem cable through the rack’s DB25
male connector (located on the right side of the rack).
Procedures provided in this document are based on connecting the DDF3088
with the RS232 Com Cable.
A.1.1 PLANTCOM
AND PLANTCOM PLUS
Polysonics offers two optional plant communication packages, PlantCom and PlantCom
Plus, which provide the following hardware for use with PolyLink:
!
PlantCom: a 6 ft (1.83 m) null modem cable (DB25 female to DB25 female) and two
adapters (DB25 male to DB9 female).
!
PlantCom Plus: all items provided with the PlantCom version plus two short haul
modems. These modems allow communications over a four-wire line for a distance of
several miles.
In addition to the above hardware, PlantCom and PlantCom Plus include the PlantCom
Utility Software diskette which contains several flowmeter communication and file transfer
utilities.
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