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11-3
Section
Command/Response Reference
219
20. The number of ACK packets received for received transmission acknowl-
edgements (ACK).
21. The number of window advertisement packets received.
UDP Status (Response)
Three items of UDP information occupying 4 bytes each are returned in the fol-
lowing sequence. Each value is returned as an 8-digit hexadecimal value.
1, 2, 3...
1. The number of packets discarded because the size of the first short buffer
was smaller than the minimum size (28) of the IP header and UDP header
when the packet was stored.
2. The number of packets discarded due to an incorrect checksum in the UDP
header.
3. The number of packets discarded because the IP overall length in the IP
header was shorter than the UDP overall length in the UDP header.
Precautions
All the above values are set to 0 if network operation stops due to incorrect set-
tings in the system setup.
Counting will be stopped when a count reaches the maximum value. The maxi-
mum values are as follows:
IP, ICMP, or UDP status: 7FFFFFFF (2,147,483,647 decimal)
TC status:
FFFFFFFF (4,294,967,295 decimal)
Response Codes
Response code
Description
0000
Normal
1001
Command too large
11-3-23
MEMORY STATUS READ
Reads the status of the Ethernet Unit’s network memory. The network memory
contains 196K bytes that are used as required as for communications buffers for
communications servicing. The network memory consists of 1,056 short buffers
(128 bytes each) and 64 long buffers (1,024 bytes each). Refer to Appendix C
Buffer Configuration.
Command Block
63
27
Command
code
Response Block
92 bytes
Command
code
Response
code
Memory
status
27
63
Parameters
Memory Status (Response)
A total of 23 data items in six areas are returned in the following order. Each item
consists of 4 bytes.
1, 2, 3...
1. Short Buffer Application: Two items are returned (8 bytes).
a) The number of short buffers currently being used.
b) The number of short buffers in the system (fixed at 1,056 decimal).
2. Short Buffer Application by Type: Thirteen items are returned (52 bytes).
a) The number of short buffers used for storing communications data.
b) The number of short buffers used for protocol headers (TCP, UDP, IP,
ICMP, ARP)
c) The number of short buffers used in socket structures