Ethernet Units Operation Manual

85
Sending Commands From a PC Section 5-3
RECV(098) With the RECV(098) instruction, the data in m number of words, starting from
the beginning word S at the remote node (node number M) is received at the
words starting from the beginning word D at the local node.
Note The message services function does not guarantee that a message will reach
the destination node. A message may be lost during transmission due to fac-
tors such as noise. In order to prevent this from occurring when using mes-
sage services, it is common to set up retry processing at the node from which
instructions are issued. With the SEND(090), RECV(098), and CMND(490)
instructions, retry processing is executed automatically by specifying the num-
ber of retries, so specify a number other than 0.
S: Remote node beginning word
D: Local beginning word
C: First word of control data (below)
Local node
Number
of words
(m)
Remote node number N
Number of reception words (m)
0001 to 03DE (Hex): 1 to 990 words
Destination network number
00 (Hex): Local network
01 to 7F (Hex): 1 to 127
Destination Unit address
00 (Hex): CPU Unit
10 to 1F: (Hex): Unit #0 to #15
E1 (Hex): Unit connected to network
FE (Hex): Unit connected to network
Remote node number M (send source)
00 to 7E (Hex); 0 to 126
The ran
g
e of node addresses is different for networks other than Ethernet.
Number of retries
0 to F (Hex): 0 to 15 retries
Communications port number: 0 to 7
Response
0: Required.
1: Not required.
Response monitor time
0000 (Hex): 2 s
0001 to FFFF (Hex): 0.1 to 6,553.5 s (in units of 1 s)
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