Question: 

My 754 seems to partially work with my transmitters via Hart, which ones are supported?

Answer:

The Fluke-754 is capable of communicating with Hart devices via the Hart protocol. 
However due to limited memory in the Fluke-754 it means the list of supported devices is also limited. 
Each firmware release will have a slightly different list of supported devices. 
Fluke tries to keep up with the most commonly used devices in the field.

Supported devices in Firmware release 1.06 (older 754) and 1.16 (newer 754): 
 

ABB                                                            
600T Rev 5.1, 5.2, 5.3
658T Rev 5.1 No Sensor Trim

ABB (Elsag Bailey)
AS800 Rev 5.2

Anderson Instruments
ANDRSN1 Rev 5.1

Endress & Hauser
Cerabar S Rev 5.1
Cerabar M Rev 5.1, 5.5, 5.7
Deltabar S Rev 5.1, 5.2, 5.5, 5.7
TMT122 Rev 5.2 No Sensor Trim
TMT162 Rev 5.1 No Sensor Trim
TMT182 Rev 5.2 No Sensor Trim

Fuji
FCX-A/C Rev 5.1
FCX-A2/C2 Rev 5.1, 5.2
FRC Rev 5.1

Foxboro
I/A Pressure Rev 5.1, 5.2

Foxboro Eckardt
TI/RTT20 Rev 5.1 No Sensor Trim

Honeywell
ST3000 Rev 5.1, 5.2, 6.4
STT25H Rev 5.1 No Sensor Trim, 5.2 No Sensor Trim
STT25T Rev 5.1 No Sensor Trim

Invensys
I/A Pressure Rev 5.1

Micro Motion
MVD 2000 Rev 5.2 No Sensor Trim, 5.3 No Sensor Trim
MVD 2000IS Rev 5.2 No Sensor Trim, 5.3 No Sensor Trim
9701 Rev 5.1 No Sensor Trim
9712 Rev 5.2 No Sensor Trim
9739 Rev 5.1 No Sensor Trim, 5.2 No Sensor Trim, 5.3 No Sensor Trim, 5.4 No Sensor Trim

Prime Measurement
344 Rev 5.1 No Sensor Trim, 5.2 No Sensor Trim

Rosemount
1151 Rev 5.4, 5.5, 5.6
2051 Rev 5.9, 7.10
2088 Smart Rev 5.3
3001C HTG Rev 5.2
3044C Temp Rev 5.1, 5.2
3051C Rev 4.1, 5.2, 5.3, 5.6, 5.7, 5.9, 7.10
3051C LP Rev 5.1
3051S Diag Rev 5.3, 7.4
3144 Temp Rev 5.1, 5.2,5.3, 5.4, 5.5, 7.6
3244 Temp Rev 5.1, 5.2
644 Temp Rev 5.3, 5.4, 5.5, 5.6, 5.7, 5.8
2088 – Rev 5.9 and 7.10
2090 – Rev 5.9 and 7.10
4600 – Rev 5.1

Siemens
Sitrans P DS Rev 5.1
Sitrans P ES Rev 5.1

Smar
TT301 Rev 5.2 No Sensor Trim
LD301 Rev 5.3

Viatran
I/A Pressure Rev 5.1

Yokogawa
EJA Rev 5.1, 5.2
YTA Rev 5.1, 5.2

Wika
UniTrans Rev 5.5 No Sensor Trim, 5.6 No Sensor Trim, 6.6 No Sensor Trim
T32 Rev 5.1 No Sensor, 5.2 No Sensor Trim