Hardy Process Solutions HI 2160RC PLUS, Operation And Installation Manual

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Chapter 7 - Serial Communications
7-1
CHAPTER 7 - SERIAL COMMUNICATIONS
About Chapter 7 All information contained in Chapter 7 pertains to serial communica-
tions for the HI 2160RC
PLUS
Rate Controller. This chapter includes
System Network Configuration, Serial Protocol and Serial Commands.
We recommend that the operator use the serial commands included in
this chapter. Although we don't recommend unauthorized changes to
the firmware, there are occasions when firmware changes enhance the
communication between the host and the Hardy controllers.
Hardy
Process Solutions
welcomes any suggestions that might enhance our
prod-ucts and would appreciate your informing Hardy Customer
Service of your requests. All maintenance personnel and users should
be familiar with the information in this chapter before trying to
communicate with the controllers from the host.
System Configuration
Host Functions 1. A host can be a Programmable Logic Controller or a Computer or
both.
2. The host provides a single operator interface to an entire process
blending or batching system.
3. The host saves recipes, calculates a variety of parameters, adjusts
formulation based on other process parameters and prints compre-
hensive reports.
Serial Protocol
Hardy Link Hardy Link is an ASCII command protocol and command set which
runs most efficiently in a RS-422 multidrop configuration, although the
commands may be transmitted over RS-232C.
Multidrop
Configuration (See
Fig. 7-1) • Multidrop is a method of interconnecting instruments in such a way
that there are multiple HI 2160RC
PLUS
's connected to a host com-
puter.
• Each HI 2160RC
PLUS
receives and sends data through a unique
address.
• Multidrop configuration uses the RS-422 option board with excel-
lent noise immunity and drive capability supporting long cable
runs.