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SYSTEM
SUPPORT SERVICES 11046 State Road 52, Hudson, FL 34669 ● (727) 243-3656 |
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SYSTEM
SUPPORT SERVICES 11046 State Road 52, Hudson, FL 34669 ● (727) 243-3656 |
| Product(s) Affected: | Micro-terminal Interface FIM (Schlage Version ONLY) |
| Model or Part Number(s): | 30-0091-2 |
| Release Date: | August 27, 1996 |
| Subject: | Hardware Revision G |
A problem was encountered with the Micro-terminal interface FIM for Schlage Model 708 Card Readers, Part Number 30-0091-2, in which reader polling would occasionally occur at a slower rate than usual. This problem manifested itself in sluggish reader operation.
It was determined that the Peripheral I/O chip on the card (8155) was not initializing properly in all cases. This is due in part to the manner in which FIM cards are traditionally installed in the backplane with power applied. If the hardware in the PIO chip does not initialize properly, the RST7.5 interrupt to the processor occurs approximately every 120 milliseconds instead of the correct timing of 10 milliseconds. Since all system timing is driven from this interrupt, the entire operation of the FIM slows down.
This problem was verified with all makes of the I/O chip currently in use, and, although the problem was encountered with the Schlage version of the board, the problem can exist in other versions of the board as well.
Revision F of the FIM incorporated a hardware change which caused a hardware reset of the board whenever the TRAP timer expired. The TRAP timer is reset by the RST7.5 interrupt. The TRAP time out is long enough so that the slow occurrence of the RST 7.5 interrupt still reset the TRAP timer.
Revision G shortens the TRAP timer value so that when the interrupt occurs too slowly, the TRAP timer will expire and reset the hardware. This reset will occur only on power transitions, and will not occur under normal operation of the FIM.
If slow reader operation is encountered with any version of the 30-0091 Micro-terminal Interface FIM, it is recommended that the board be returned to System Support Services for repair and upgrade. The upgrade will be performed at no additional charge as a part of the normal flat repair charge for the board.
To have SYSTEM SUPPORT SERVICES repair, test, and update the modules as necessary, call Customer Service for a Return Material Authorization number. Have available the part number of the module to be repaired and upgraded, and the quantity. We will quote a repair price and delivery turnaround at that time.
E-mail: service@sysupport.com
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