Company Logo

Monday, July 13, 2009

Service Memo

COM Port Driver Issue


image
APPLIES FOR THE FOLLOWING HATTELAND® PRODUCTS:

Stand-alone Computer:
HT B04xx xxx-xx, HT B04PM MIL-xx

Panel Computers - Series 1
JH 10T08 xxx-xx, JH 15T05 MMC-xx, JH 19T02 MMC-xx

Note: Customized models are ALSO affected by this Service Memo.


OVERVIEW:
During test of unused COM ports (3-6) connected to an active network, a problem with high CPU load was discovered. The problem is related to unhandled interrupts in the driver layers. For all "open" COM ports, the interrupts are handled and this error will therefore not reoccur.


PROBLEM DESCRIPTION:
- High CPU load when receiving data at any of COM3, COM4, COM5 and COM6 when these
  are configured to RS232/RS422/RS485 mode.
- The problem occurs when affected COM ports are unused in the software application.


CAUSE:
Interrupts caused by the incoming data is not handled by current COM driver present at the Hatteland Display BSP CD. (Current driver Moschip Nm9845. version:5.0.2183.1)


SOLUTION:
For Microsoft® Windows XP®, use driver for MSC9845 version 2.0.0.7 or later.
Available at Moschip homepage - http://www.moschip.com/mcs9845_downloads.php



For further enquiries regarding this Service Memo, please contact Technical Support Division at Hatteland Display.




Implemented by:
____________________________________________________
image
Frode Grindheim
Vice President Product Management
Hatteland Display AS
Read and Understood by:
_______________________________________




(Your name and Company)


Links to relevant file(s):
image ds_htb04pmmil.pdf (283kb) Specifications HT B04PM MIL-xx models
image ds_htb04xxstd.pdf (235kb) Specifications HT B04xx xxx-xx models
image ds_jh10t08mmc.pdf (607kb) Specifications JH 10T08 xxx-xx models
image ds_jh15t05mmc.pdf (605kb) Specifications JH 15T05 MMC-xx models
image ds_jh19t02mmc.pdf (292kb) Specifications JH 19T02 MMC-xx models
 


Hatteland Display AS
Åmsosen, N-5578 Nedre Vats, Norway
Tel: (+47) 5276 3700 - Fax: (+47) 5276 5444
www.hatteland-display.com