March 2021
Installation, Operation and Maintenance Manual
MDE 254 Rev. 1
HART Command Set42
Section 8: HART Command Set
Code Physical Signal Definition
0 No – No Write Protected
1 Yes – Write Protected
250 Not used
251 None
252 Unknown
253 Special
253 Special
Code (Dec) Code (Hex) Company Name
183 00B7 Biffi
Code Burst Mode Control Definition
0 Off
1 Enable Burst on Token-Passing Data Link Layer only
2 Enable Burst on TDMA Data-Link Layer only
3 Enable Burst on TDMA and Token-Passing Data Link Layers
250 Reserved
251 Reserved
252 Reserved
253 Reserved
Code Physical Signal Definition
0 Bell 202 current
1 Bell 202 voltage
2 RS-485
3 RS-232
4 Wireless
6 Special
Code Flag Assignment Definition
00 Undefined
01 Multi-Sensor Field Device
02 Eeprom Control
04 Protocol Bridge Device
08 IEEE 802.15.4 2.4GHz DSS with O-QPSK Modulation
10 - 20 Undefined
40 C8psk Capable Field Device
80 C8psk In Multi-Drop Only
Table 123. Write Protect Codes
Table 124. Manufacturer Identification Codes
Table 125. Burst Mode Control Codes
Table 126. Physical Signalling Codes
Table 127. Flag Assignments
NOTE: Other manufacturers are not listed.
NOTE: Only codes 0 and 1 are supported by HRT2000v4 field device.
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