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KB84577
OptoMMP memory map Digital Point Write Turn On/Off areas write with any value
Revision:  2.0
Published:  12/10/2015
Applies To
SNAP-PAC-R1
SNAP-PAC-R1-B
SNAP-PAC-R1-FM
SNAP-PAC-R1-W
SNAP-PAC-R2
SNAP-PAC-R2-FM
SNAP-PAC-R2-W
SNAP-PAC-EB1
SNAP-PAC-EB1-FM
SNAP-PAC-EB1-W
SNAP-PAC-EB2
SNAP-PAC-EB2-FM
SNAP-PAC-EB2-W
G4D32EB2
G4D32EB2-UPG
SNAP-PAC-SB1
SNAP-PAC-SB2
Versions
Problem affects versions:  
Firmware R8.1a and higher
Problem is fixed in version:  
PAC Firmware R9.4c

SYMPTOMS

In the OptoMMP memory map, when you use the Digital Point Write Area (0xF0900000) to turn a module on and off, any write will have an effect, not just non-zero writes. This means that a write of 0x00000000 to the Turn On area of a point will cause the point to turn on, and the same for a write to the Turn Off area. This behavior contradicts documentation in the OptoMMP Protocol Guide (form 1465, page 150).

This issue may affect you if you are using a custom OptoMMP program or a PAC Manager Generic Read/Write to these areas of the memory map.

WORKAROUND

Don't write 0x00000000 to Turn On/Off areas.

RESOLUTION

Opto 22 has resolved this issue.

Relevant Downloads
No relevant downloads have been specified.
Questions? Contact Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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