Chapter 6 – Communications
Page 60
TestEquity 101H Temperature/Humidity Chamber
Common Modbus Registers
The following registers are applicable in the F4T Mode (Data Map 1). These are the most
common registers that would need to be used in an automation environment.
Some F4T parameters are contained within 32 bits (IEEE Float). Notice that only one (low order)
of the two registers is listed. By default, the low order word contains the two low bytes of the 32-
bit parameter. As an example, in the table below see Actual Chamber Temperature. Note that it
lists register 27586. Because this parameter is a float, it is actually represented by registers 27586
(low order bytes) and 27587 (high order bytes).
Parameter Name
Register
Data Type and Access (Read or Write)
Temperature Set Point
2782
IEEE Float RW
Closed Loop Set Point*
2810
IEEE Float R
Actual Chamber Temperature 27586
IEEE Float R
Humidity Set Point
2942
IEEE Float RW
Closed Loop Set Point*
2970
IEEE Float R
Actual Chamber Humidity
28906
IEEE Float R
Event 1
16594
16-bit RW
Event 2
16596
16-bit RW
Event 3
16598
16-bit RW
Event 4
16600
16-bit RW
Events 1-4
Off = 62, On = 63
* Instantaneous Set Point during a ramp or profile
Manual Ramp Parameters (Ramp to Set Point without a profile)
Ramp Action (Temperature)
2794
Off = 62
Startup = 88
Set Point = 85
Both = 13
Ramp Scale (Temperature)
2796
°/Minutes = 57
°/Hours = 39
Ramp Rate (Temperature)
2798
