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8
4.1. Data transmission formats
■ Note: The term “trip status” used in this manual includes retry waiting status and trip retention status.
4.1.1. Data transmission formats 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 → VF-S11
Omissible in one-to-one communications For the W and P commands only Omissible
"("
(28H)
INV-NO
2 bytes
CMD
1 byte
Communication No.
4 bytes
DATA
0 to 4 bytes
"&"
(26H)
SUM
2 bytes
")"
(29H)
CR
(0DH)
Checksum area
Omissible
1. “(“ (1 byte) : Start code in ASCII mode
2. INV-NO (2 bytes) : Inverter number (Omissible in one-to-one communications) ... 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 communications, 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
W (57H): RAM/EEPROM write command
P (50H) RAM write command
No data
Write data (0 to FFFF)
Write data (0 to FFFF)