Curtis 3301T - PDO Communication and Configuration

6 — CANopen COMMUNICATIONS
Curtis Model 3301T Digital Instrumentation – September 2021
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pg. 48
e following table lists the control byte values for the various transfer types:
Transfer Type Command Byte
Write data to a device Depends upon the data size:
• 1 byte = 2Fh
• 2 bytes = 2Bh
• 3 bytes = 27h
• 4 bytes = 23h
Conrm a write 60h
Request data from a device 40h
Device responds with requested data Depends upon the data size:
• 1 byte = 4Fh
• 2 bytes = 4Bh
• 3 bytes = 47h
• 4 bytes = 43h
Abort SDO 80h
PDOs
TPDOs 1–2 and RPDOs 1–3 are preconfigured to transmit and receive data used by the
3301T-7001’s preset user interfaces. e following topics describe PDO considerations and the
precongured PDOs.
Note: TPDOs 3–4 and RPDO4 are reserved.
PDO COB-IDs
e following table lists the COB-IDs of the precongured PDOs:
PDO COB-ID
RPDO1 22Eh
RPDO2 32Eh
RPDO3 42Eh
TPDO1 1AEh
TPDO2 2AEh
PDO Timing
e 3301T's PDOs are asynchronous and are periodically transmitted and received. e 3301T does
not support synchronous PDOs. e following list describes the PDOs’ event times:
• RPDOs: 60,000ms (1 minute). If the 3301T does not receive data within one minute, the LCD
will display *.* to indicate that data is not being received.
• TPDOs: 40ms