Product Notifications

Service Memo Notification

Public | Finalized Published: 13 July 2009 - Reference: 20_2009_SM

COM Port Driver Issue

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.
HT B04xx xxx-xx
HT B04PM MIL-xx
JH 10T08 xxx-xx
JH 15T05 MMC-xx
JH 19T02 MMC-xx

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

HT B04xx xxx-xx

Description / Sympton(s):

- 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.

Contact:

For further enquiries regarding this Service Memo Notification, please contact Support at Hatteland Technology AS.

Attachments:

Specifications HT B04PM MIL-xx models (647.0kb)
ds_htb04pmmil.pdf Specifications HT B04xx xxx-xx models (294.2kb)
ds_htb04xxstd.pdf Specifications JH 10T08 xxx-xx models (607.4kb)
ds_jh10t08mmc.pdf Specifications JH 15T05 MMC-xx models (605.1kb)
ds_jh15t05mmc.pdf Specifications JH 19T02 MMC-xx models (292.3kb)
ds_jh19t02mmc.pdf

Matching products online:

HT B04PM MIL-xx

Implemented by:

________________________________

Frode Grindheim
VP Products
Hatteland Technology AS

Read and Understood by:

________________________________

(Your name)
(Your company)

Last revised: 23 April 2024