TestEquity F4T User Manual

Chapter 4 – Communications
TestEquity F4T Controller Page 51
Programming Syntax for the F4T Controller, Data Map 1
The following applies if the F4T serial interface is configured for Data Map 1. This only applies
for programming through the GPIB or Ethernet Modbus converters.
The F4T Controller uses two consecutive register to control a value or to read back a process
variable. The two registers hold an IEEE-754 32-bit floating point word. The registers are read
and written to in the low word-upper word order. The RF? query reads a 32-bit floating point
value from two sequential register in low word-upper word order. The RF? does not require the
number of registers to read since it is fixed at two registers.
Some registers in the F4T Controller are 16-bit words. These registers are programmed with the
same syntax as shown for Data Map 2 below.
Modbus Register Read / Write Commands
RF? reg Read register command
The WF command writes the num value in floating point format to two consecutive registers
starting with the low word register.
WF reg, data Write register command
Reg = Modbus register plus next consecutive register
Data = ASCII data written as a direct numerical value
Examples:
Write Temperature Set Point WF 2782, value
Write Humidity Set Point WF 2942, value
Read Chamber Temperature RF? 27586
Read Closed Loop Set Point RF? 2810 (instantaneous temperature set point during a ramp
or profile)
Read Chamber Humidity RF? 28906
Read Closed Loop Set Point RF? 2970 (instantaneous humidity set point during a ramp
or profile)
Turn (Event 1) ON W 16594, 63 Event 1 is “Power”
Turn (Event 1) OFF W 16594, 62
Turn (Event 2) ON W 16596, 63 Event 2 is “Humidity” in Humidity models
Turn (Event 2) OFF W 16596, 62 Event 2 is “Purge” in Temperature models
Event 2 is “LN2” in Model 3007C

TestEquity F4T Specifications

General

Brand	TestEquity
Model	F4T
Category	Controller
Language	English