10 HART® 7 specification
70
10.5 Performance data
The parameters that are listed below determine the performance of the process pressure transmitter.
Telegram length
The maximum telegraph length of up to 68 bytes occurs with this HART® 7 device with command 9 (39
bytes payload including 2 status bytes).
Operating modes
The process pressure transmitter has three output operating modes:
• Standard mode (single mode): current proportional to measurand
• Current generator mode: current is adjusted through HART® command 40 or through adjustment
parameter "P8 mA"
• Constant current mode (multidrop mode): current is set to constant 4 mA in bus operation (HART®
command 6)
Write protection
The device can be protected against unintentional overwriting of a parameter through a keyboard lock.
• At the device through parameter "P10 key"
• In the setup program under "Further maintenance data - Inhibit (P10)"
• Via HART® command 136 and 137
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