Emerson 5300, 5400 specifications Implemented Functions of Levelmaster Protocol

Manual Supplement

00809-0500-4530, Rev AA October 2010

Rosemount 5300/5400 Series

Table 1-8. Implemented Functions of Levelmaster Protocol

Table 1-9. Letters and Expressions Used in Previous Tables

In Table 1-8 and Table 1-9 is a description of the implemented functions of Levelmaster protocol in the HMC.

Input format	Description	Output format
UnnN?	Return ID number	UnnNnnCcccc
UnnNmm	Set ID number	UnnNOKCcccc
UnnF?	Return number of floats	UnnFxCcccc
UnnFx?	Set number of floats	UnnFOKCcccc
Unn?	Return floats and other data	UnnDddd.ddFfffEeeee
		WwwwCcccc(1)

(1)In this case, number of floats is set to 1. If number of floats is set to 2, the Output Format would be: UnnDddd.ddDddd.ddFfffEeeeeWwwwCcccc

NOTE

If one float is sent, it is “Float1”. If two floats are sent, it is “Float 1” before “Float 0”.

Letter	Description
	nn is used to identify slave to respond,
nn	nn is a number 00-99 or ** (wildcard).
	The EmulCtrl Address Holding register can be configured to a higher
	value than 99. In that case, the address will be truncated to 99.
mm	mm is the new ID number for the slave; mm is a number 00-99.
x	x is the number of floats returned when slave receives Unn?, x is a
	number 0-2.
cccc	Is the 16 bit CRC checksum, cccc are hexadecimal characters.
ddd.dd	ddd.dd is the distance value from slave 1. Note that the first d can also be
	a ‘-’ (minus).
Float 1	Slave 1 PV.
Float 0	Slave 1 SV.
fff	The temperature value. Configured by Holding Register 3208 in HMC.(1)
	An error value.
eeee	Bit 0: Invalid SV value (Float 0).
	Bit 8: Invalid Temperature value.
	Bit 12: Invalid PV value (Float 1).
Wwww	A warning value, not used in this implementation.

(1)Any of the four available variables from any of the five HART slaves can be selected as the temperature source.

The least four significant bits (bit 0-3) select the variable number. Bits 4-7 select the HART slave address. If invalid values are used, the temperature value will be invalid, with no Error bit set.

For example, if we want to use FV from HART Slave 3 as temperature source, we have to write the value 34 Hex (52 decimal).

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