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User Guide
Chapter 13 SPI Protocol Option
The system communicates with any central network or molding machine that supports the
Society of Plastics Industry (SPI) standard protocol.
The system assumes a device ID of 26h on the SPI communications channel. This ID has been
assigned to general-purpose temperature controllers with multiple zones. The system
supports a subset of the commands that have been defined for this ID. The commands for
this ID that are not supported by the system do not have equivalent functions in the system.
13.1 SPI Command Summary
The SPI commands supported by the system are listed below. The system supports the
defined poll and select functions for each command. If a selected command is directed to all
zones in the system, the error requirements must be satisfied for every zone before an ACK is
returned.
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13.1.1 Echo
Summary
Errors
Version Summary
Errors
SPI Command Summary
v 1.4 — September 2015
Echo.
Version.
Process Setpoint 1.
Process Value.
Alarm Active Status.
Alarm 1 Setpoint.
Alarm 2 Setpoint.
Alarm 1 Reset.
Controller Status.
Manual Percentage Output.
Open/Close Loop Control.
SPI controller integrity command.
If the data length for the selected function is incorrect, the system will
return a NAK.
The system transmits the device ID (26h) and SPI software version
number.
None.
SPI Protocol Option
105
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