Toshiba RS485, VF-AS1 Series Data transmission format used in Ascii mode, Inv-No Cmd, Sum

E6581315

4.1. Data transmission format

„Note: The term “trip status” used in this manual includes retry waiting status and trip retention status.

4.1.1. Data transmission format used in ASCII mode

A communication number is used to specify a data item, all data is written in hexadecimal, and JIS- X-0201 (ASCII (ANSI))-compliant transmission characters are used.

„Computer → Inverter

Omissible in one-to-one communication For the W and P commands only Omissible

(3.5bytes

Blank)

"("

(28H)

INV-NO	CMD
2 bytes	1 byte

Communication No.

4 bytes

DATA

0 to 4 bytes

"&"

(26H)

SUM

2 bytes

")"

(29H)

CR

(0DH)

(3.5bytes

Blank)

Checksum area

Omissible

1. “(“ (1 byte) : Start code in ASCII mode

2.INV-NO (2 bytes) : Inverter number (Omissible in one-to-one communication) ... 00 (30H, 30H) to 99 (39H, 39h), *(2AH)

The command is executed only when the inverter number matches up with that specified using a parameter.

(When * is specified in broadcast communication, the inverter number is assumed to match if all numbers except * match. When * is specified instead of each digit (two-digit number), all inverters connected are assumed to match.)

If the inverter number does not match or if the inverter number is of one digit, the data will be judged invalid and no data will be returned.

3. CMD (1 byte) : Command (For details, see the table below.)

4.Communication No.(4 bytes)

:Communication number (See 11, “Parameter data.”)

5.Data (0 to 4 bytes): Write data (valid for the W and P commands only)

6.	“&” (1 byte)	: Checksum discrimination code (omissible. When omitting this code, you also need to omit
		the checksum.)
7.	Sum (2 bytes)	: Checksum (omissible)
		Add the ASCII-coded value of the last two digits (4 bits/digit) of the sum of a series of bits
		(ASCII codes) from the start code to the checksum discrimination code.
		Ex.: (R0000&??) CR
		28H+52H+30H+30H+30H+30H+26H=160H
		The last two digits represent the checksum. = 60
		When omitting the checksum, you also need to omit the checksum discrimination
		code.
8.	“)” (1 byte)	: Stop code (omissible)
9.	CR (1 byte)	: Carriage return code

„ Details of commands and data

CMD (1 byte)	Write data (0 to 4 bytes) Hexadecimal number
R (52H): RAM read command	No data
W (57H): RAM/EEPROM write command	Write data (0 to FFFF)
P (50H) RAM write command	Write data (0 to FFFF)

7