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Curtis Model 3301T Digital Instrumentation – September 2021
The 3301T complies with the CAN in Automation (CiA) CANopen DS 301 specification. This chapter
describes the 3301T's CANopen features.
Some familiarity with CANopen is a prerequisite. For CANopen information, see the following pages
on the CiA web site:
• Overview:
• Specifications:
BYTE AND BIT SEQUENCE ORDER
CANopen message byte sequences are transmitted with the least significant byte first (little-
endian format).
Note: This manual uses the LSB 0 Numbering convention when referring to byte and bit numbers.
For example, the following table shows an SDO that writes the data 04E2h to the object with the
index and sub-index 334C-01h:
Strings are read from left to right. The following example shows how the 3301T transmits an SDO
segment for the string "3301T-7":
Bit sequences are transmitted from most significant to least significant bit (big-endian format). The
following example shows how the 3301T transmits the bits for the value 2Bh:
pg. 46
6 — CANopen COMMUNICATIONS
https://www.can-cia.org/canopen/
https://www.can-cia.org/groups/specifications/
0
1
Control Byte
Index
2Bh
4Ch
0
1
Control Byte
00h
33h = "3"
33h = "3"
7
6
0
0
2
3
4
Sub-index
33h
01h
E2h
2
3
4
Data
30h = "0"
31h = "1"
5
4
3
1
0
1
Return to TOC
5
6
Data
04h
00h
5
6
54h = "T"
2Dh = "-"
37h = "7"
2
1
0
1
6 — CANopen COMMUNICATIONS
7
00h
7
0
1
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