GE EPM 9650/9800 manual Function Code 06-Preset Single Register, Data Starting Address

1.4.2: Function Code 06—Preset Single Register

This function allows a Master station to modify a single register in an EPM Slave. The data registers are 16-bit (two byte) values transmitted high-ordered byte first, low-ordered byte second.

In the following example, a Master device stores the value 0001H at Register 57346 in an EPM Slave at address 01H.

Table 1.3: Function Code 6 Example
Master Packet		Slave Packet
Slave Address	01H	Slave Address	01H
Function Code	06H	Function Code	06H
Data Starting Address-Hi	E0H	Data Starting Address-Hi	E0H
Data Starting Address-Lo	01H	Data Starting Address-Lo	01H
Data-Hi	00H	Data-Hi	00H
Data-Lo	01H	Data-Lo	01H
CRC-Lo	2EH	CRC-Lo	2EH
CRC-Hi	0AH	CRC-Hi	0AH

1.4.3: Function Code 10—Preset Multiple Registers

This function allows a Master station to modify a group of consecutive registers in an EPM Slave. Registers are 16-bit (two byte) values transmitted high-ordered byte first, low-ordered byte second.

In the following example, a Master device stores the value 0001H at Register 57345, 0001H at Register 57346 and 0001H at Register 57347 in an EPM Slave at address 01H.

1.4.4: Data Starting Address

Range in Hex: 0000H - FFFFH

Range in Decimal: 00001 - 65536

The Address in Chapter 2 (EPM Modbus Register Map Excel Spreadsheet) is in Decimal.

Example: For some Scada Softwares, to read Holding Registers (1.4.1), Address Format should be: 4(XXXXX) with the XXXXX being our Decimal Address.

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