Each telegram begins with a start character (STX) =
02 Hex, followed by a byte that denotes the length of
the telegram (LGE) and a byte that denotes the ad-
dress of the frequency converter (ADR). Then follows
a number of data bytes (variable, depending on the
type of telegram). The telegram is completed by a
data control byte (BCC).
Telegram timing
The communication speed between a master and a
slave depends on the baud rate. The frequency con-
verter's baud rate must be the same as the master's
baud rate and be selected in parameter 501
Bau-
drate
.
After a response telegram from the slave, there must
be a pause of at least 2 characters (22 bits) before the
master can send a new telegram. At a baud rate of
9600 baud there must be a pause of at least 2.3 ms.
When the master has completed the telegram, the
slave's response time back to the master will be a
maximum of 20 ms, and there will be pause of at least
2 characters.
Pause time, min: 2 characters
Response time, min: 2 characters
Response time, max: 20 ms
The time between the individual characters in a tele-
gram may not exceed 2 characters and the telegram
must be completed within 1.5 x nominal telegram
time. At a baud rate of 9600 baud and a telegram
length of 16 bytes the telegram will be completed af-
ter 27.5 msec.
Telegram length (LGE)
The telegram length is the number of data bytes plus
the address byte ADR plus the data control byte BCC.
The length of telegrams with 4 data bytes is:
LGE = 4 + 1 + 1 = 6 bytes
The length of telegrams with 12 data bytes is:
LGE = 12 + 1 + 1 = 14 bytes
The length of telegrams containing texts is 10+n
bytes. 10 represents the fixed characters, while the 'n'
is variable (depending on the length of the text).
TR1
2800
Series
VFD
55
Telegram Structure
Programming
Содержание VarioTrane TR1 2800 Series
Страница 2: ...T TR R1 1 2 28 80 00 0 S Se er ri ie es s V VF FD D 1 1...
Страница 3: ...2 2 T TR R1 1 2 28 80 00 0 S Se er ri ie es s V VF FD D...
Страница 4: ...TR1 2800 Series VFD 3...
Страница 7: ...6 TR1 2800 Series VFD...
Страница 87: ...Illustration 5 7 192H4719 Illustration 5 8 192H4720 86 TR1 2800 Series VFD...
Страница 95: ...Branch Circuit Protection Short circuit protection 94 TR1 2800 Series VFD...
Страница 107: ...All about TR1 2800 Series VFD 106 TR1 2800 Series VFD...