Impulse PCW-5181 Write Requests, Interpreting the Transmission Status Response

Appendix B - Impulse Advanced Programming
B-3
Write Requests
The following example illustrates a write request of zero to parameter index #113 (Commanded
Position) to unit #1. Bytes are shown in hexadecimal format.
After sending the write request, the host system would need to wait for the drive to respond before
sending another read query or write request. The drive responds to a write with a standard frame of
unit address, a parameter index of zero, data and checksum. A successful write response is as
follows:
A non-zero transmission status indicates an error has occurred. Interpreting the transmission status
is covered in the next topic.
Interpreting the Transmission Status Response
Whenever an error occurs during a transmission received by the drive, the drive reports the error in
the Transmission Status Response. Error response are defined as follows:
0 No Error
4 Receive Checksum Error
8 Invalid Parameter Data Field Length
Checksum Upper Byte
Checksum Lower Byte (Address + Index + Data)
Cmd Position Upper Byte, Upper Word
Cmd Position Lower Byte, Upper Word
Cmd Position Upper Byte, Lower Word
Cmd Position Lower Byte, Lower Word
Parameter Index 113
Unit Address #1
01 71 00 00 00 00 72 00
Checksum Upper Byte
Checksum Lower Byte (Address + Index + Data)
Transmission Status Upper Byte
Transmission Status Lower Byte
Parameter Index 113
Unit Address #1
01 00 00 00 01 00