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KB80743
High latency network (modems) may cause SNAP PAC controller to I/O unit communication problems
Revision:  2.0
Published:  5/12/2010
Applies To
SNAP-PAC-S1
SNAP-PAC-S2
SNAP-PAC-R1
SNAP-PAC-R2
SNAP-PAC-S1-W
SNAP-PAC-S2-W
SNAP-PAC-R1-W
SNAP-PAC-R2-W
Versions
Problem was discovered in version:  
R8.5a
Problem is fixed in version:  
R8.5c

SYMPTOMS

A SNAP-PAC control engine may have trouble communicating with an Ethernet brain over a wireless network device with a high latency response time (such as a cellular or radio modem). An error message is not posted to indicate there was a problem communicating to the I/O unit. The data received contained all zeroes.

Here's an example of a SNAP PAC Ethernet system over a wireless device with a high latency response time:

A SNAP PAC control engine is communicating via Ethernet to a radio modem.  At a remote location, a radio modem is communicating over Ethernet to a SNAP PAC Ethernet brain.

CASE STATUS

Opto 22 has resolved this issue.

The corrected firmware permits additional communication attempts based on the I/O unit's configured number of Tries and Timeout values.

These values can be changed within the strategy with the  Send Communication Handle Command.

The error message -37 Timeout on lock is sent to the controller message queue if no connection is made.

Relevant Downloads
No relevant downloads have been specified.
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Email: support@opto22.com

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