User's Manual

Table Of Contents
E DEVICENET PROTOCOL EXAMPLES
For the HDR Device Type, when the DeviceNet Scanner Host has data
available to send to the LRP830, it must set the "REQ" bit in the DeviceNet
message header. If the message length is 30 bytes, then the message is frag
-
mented and structured as follows from the master scanner. The header byte
is underlined and italicized. DeviceNet Polled protocol is used.
Examples
The following are actual DeviceNet bus message captures by
SS-Technologies DeviceNet Analyzer
®
software. The first four examples are
based on a 30-byte message length and the last on a 28-byte message length.
Generic: GEN (config display notation)
Command to LRP830: Standard ABx Block Write
This example is from the explanation of ABxS Command 5 found in Section 6.3. It will write 4 bytes of
data to the a starting at address 0064H. A timeout of 2 seconds (07D0H = 2000 x 1 ms) is set for the com-
pletion of the Block Write.
MCID/MSGID Lgth Frg User Data
<63>2:05 [5FD] 08 00
AA 06 00 64 00 04 07
<63>2:05 [5FD] 08 41
D0 00 52 00 46 00 49
<63>2:05 [5FD] 08 42
00 44 FF FF
00 00 00
<63>2:05 [5FD] 08 43 00 00 00 00 00 00 00
<63>2:05 [5FD] 03 84 00 00
Command Response: Standard ABx Block Write
The LRP830 will respond with a command acknowledgment as shown below, or an error message.
MCID/MSGID Lgth Frg User Data
<63>1:15 [3FF] 08 00
AA 06 FF FF
00 00 00
<63>1:15 [3FF] 08 41 00 00 00 00 00 00 00
<63>1:15 [3FF] 08 42 00 00 00 00 00 00 00
<63>1:15 [3FF] 08 43 00 00 00 00 00 00 00
<63>1:15 [3FF] 00 84 00 00
Copyright © 2000 Escort Memory Systems
178 LRP830-Series Long-Range Passive Reader/Writer