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KB56949
DTR signal on SNAP-PAC-S1 port 0 is asserted at power-up
Revision:  2.0
Published:  5/21/2007
Applies To
Firmware for:
SNAP-PAC-S1
Versions
Problem was introduced in version:  
R7.0a
Problem is fixed in version:  
R8.0c

SYMPTOMS

The DTR signal on the SNAP-PAC-S1’s serial Port 0 is asserted at power up. As a result, if a modem is connected to this port, the data received by the control engine may be incomplete. The line remains asserted until Port 0 is opened and closed by PAC Control strategy logic, the value 0x00000000 is written to memory map address 0xF0310804, or the controller’s PPP service opens and closes an outgoing connection on the port.

WORKAROUND

To resolve this issue, perform one of the following:

  1. Write 0x00000000 to memory map address 0xF0310804 immediately after powering up using a PAC Control strategy.
  2. Open and close a communication handle for port 0 (for example, “ser:0,9600,n,8,1”) with a PAC Control strategy.

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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