Delta Electronics VFD-M manual 1 +15V 2 GND 3 SG- 4 SG+ 5 NC 6 1 6 for communication, Data Format

Chapter 4 Parameters

Each drive has a built-in RS-485 serial interface, marked (RJ-11 Jack) on the control terminal block, whose pins are defined as shown:

1: +15V 2: GND

3: SG- 4: SG+

5: NC

6 1 6: for communication

Either ASCII or RTU Modbus protocols are used for communication. Users can select the desired mode along through parameters Pr.92 and Pr.113.

Each VFD-M AC drive has a pre-assigned communication address specified by Pr.88. The master controller communicates with each AC drive according to its particular address.

Code Meaning:

ASCII mode:

Each 8-bit data is the combination of two ASCII characters. For example, a 1-byte data: 64 Hex, shown as ‘64’ in ASCII, consists of ‘6’ (36Hex) and ‘4’ (34Hex).

Character	‘0’	‘1’	‘2’	‘3’	‘4’	‘5’	‘6’	‘7’
ASCII code	30H	31H	32H	33H	34H	35H	36H	37H
Character	‘8’	‘9’	‘A’	‘B’	‘C’	‘D’	‘E’	‘F’
ASCII code	38H	39H	41H	42H	43H	44H	45H	46H

RTU mode:

Each 8-bit data is the combination of two 4-bit hexadecimal characters. For example, 64 Hex.

2.Data Format

2.110-bit character frame (For 7-bit character):

	( 7.N.2 : Pr.92=0)
	Start			0	1	2			3	4	5	6	Stop	Stop
		bit											bit	bit
								7-bit character
						10	-bit character frame
	( 7.E.1: Pr.92=1)
	Start			0	1	2			3	4	5	6	Even	Stop
		bit											parity	bit
								7-bit character
						10	-bit character frame
	( 7.O.1:Pr.92=2)
	Start			0	1	2			3	4	5	6	Odd	Stop
			bit										parity	bit
								7-bit character
						10		-bit character frame
4-60													Revision May 2008, ME14, SW V3.04