Rockwell Automation 1203-SM1 SLC to SCANport Communication Module - Manual (Page 73)

SCANport Messaging B–7
Publication 1203–5.9 –– October 1996
Read Number of Parameters
The Read Number of Parameters message lets you request how many
parameters the SCANport device supports. The following is an
example of this request:
Service=Get Attribute Single
Parameter Class
Instance
Attribute=Last Parameter Number
Data Length = 0
M0:e.000
M0:e.001
M0:e.002
M0:e.003
M0:e.004
000e
000f
0000
0002
0000
Value
Read Number of Parameters
Service=Get Attribute Single
Parameter Class
Instance
Attribute=Last Parameter Number
Data Length=6 Bytes
M1:e.100
M1:e.101
M1:e.102
M1:e.103
M1:e.104
000e
000f
0000
0002
0006
Value
Data=216 Parameters M1:e.105 00d8
Discard M1:e.106 0000
Discard M1:e.107 0000
Response
Figure B.4 shows an example of a Read Number of Parameters
request. The reply to the Read Number of Parameters request
message indicates that the SCANport device contains 216 (D8h)
parameters.
Figure B.4
Example of Read Number of Parameters
address 0 1 2 3 4 5 6 7 8 9
N10:0 000e 000f 0000 0002 0000 0000 0000 0000 0000 0000
address 0 1 2 3 4 5 6 7 8 9
N11:0 000e 000f 0000 0002 0006 00d8 0000 0000 0000 0000