538
ACU-RITE Technical Manual MILLPWR
G2
At the end of every block, the receiver checks whether it has been transferred
correctly.
To do this, the receiver computes a BCC from the received block and com-
pares it with the received BCC. If the received BCC and the computed BCC
are identical, the receiver transmits the character <ACK> for positive acknowl-
edgment. If the two BCCs are not identical, the data block was not transmitted
correctly. The receiver transmits the character <NAK> for negative acknowl-
edgment. The block must be re-transmitted. This process is repeated up to 15
times.
If the header is acknowledged with <ACK>, the first file block can be transmit-
ted:
The beginning of a file block is identified by the control character <STX>. The
remaining control characters in this block are identical with the control charac-
ters in the header. If this block is acknowledged by <ACK>, then the next pro-
gram block is transmitted. If <NAK> is transmitted, the same block has to be
re-transmitted, etc. Once the last program block has been acknowledged by
<ACK>, the transmission is terminated by the characters <ETX> (end of text)
and <EOT> (end of transmission).
Handshaking
The character <DC1> (XON) follows the BCC. This character is required by
many devices to explicitly request the transmission once again from the trans-
mitter.
The <DC1> character is not required for downloading a file in the BCC format.
The transmitter waits and only resumes data transmission when the receiver
has transmitted a positive (ACK) or negative (NAK) acknowledgment to indi-
cate that the receiving buffer is ready.
To disable transmission of the character <DC1>:
Set
MP_flowControl
to NONE.
Example:
A file with the name PPP is to be transferred to a peripheral device (e.g.
HEIDENHAIN FE 401 Floppy Disk Unit).
Control to peripheral device
Peripheral device to control
<SOH><L>PPP<A><ETB>BCC
ACK
<STX>“1st line”<ETB>BCC
<ACK>
...
...
<STX>“10th line”<ETB>BCC
<NAK>
<STX>“10th line”<ETB>BCC
<ACK>
<STX>“11th line”<ETB>BCC
<ACK>
...
...
<STX>“last line”<ETB>BCC
<ACK>
<ETX><EOT>
Summary of Contents for MILLPWR G2
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Page 58: ...58 ACU RITE Technical Manual MILLPWRG2 3 10 3 USB Hub ...
Page 60: ...60 ACU RITE Technical Manual MILLPWRG2 TS 220 Adapter cable for TS 120 TS 220 ...
Page 61: ...3 10 Dimensions 61 SE 640 transmitter receiver unit ...
Page 62: ...62 ACU RITE Technical Manual MILLPWRG2 SE 540 transmitter receiver unit ...
Page 63: ...3 10 Dimensions 63 TS 440 TS 640 ...
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