Specifications

Net-2000™ VCU Users Manual
Version 4.0, December, 2013
Interface Protocol
6.3.5 Ack Packet
The Ack packet is used to acknowledge the Reset packet when the VCU is in File Mode.
Ack Packet
16 bit Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bytes
Byte (n) Byte (n+1)
Parameter Name
0 - 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 len
2 - 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 type
Header
4 - 5 x x x x x x x x x x x x x x x x seq
6 – 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 cmd
Table 44 Ack Packet
Ack packets have the following format described Table 44and C-language data structure below:
struct ac
k_packet_t {
short len;
short type;
short seq;
short cmd;
};
The size of the Ack packet is eight bytes. The elements of the Ack packet are described in detail in the following
sections.
6.3.5.1 Ack Packet Bytes 0 & 1 (len)
The len parameter (bytes 0 and 1) hold the 16-bit length of the packet (Table 45). The packet length is eight bytes.
len = Length (in bytes) of total packet (including header)
16 bit Word
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Byte 0 Byte 1 Decimal Value
Ack Packet Size 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 8 bytes
Table 45 len Header Parameter
(Subject to Change) Page 56
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