Workstation 5 Field Service Guide
2-25
Workstation 5 System Board Technical Descriptions
Point Of Sale Interfaces
Mag Stripe Reader Interface (REF: ABRD88 - Sheets 17, 19, 33)
Figure 2-12, displays a simplified block diagram of the WS5 Mag Stripe
Interface.
The MSR is assigned to UART A in U35, Super IO #2 and occupies COM2.
The reader connects to CN14, an 8-pin modular connector mounted along the
right side of the system board.
The serial reader operates at
VCC3
(3.3V) voltage levels. However, UART A
in Super IO #2 operates at
VCC5
. This requires level shifters U13 and U14 to
interface the reader to the UART.
MSR_DTR
supplies operating power to the Mag Stripe Reader. It also can be
used to reset the reader. In the Mag Stripe Reader Test of the DiagUtility,
pressing the [Reset Mag Reader] causes the API to bring
MSR_DTR
low, then
high, effectively resetting the controller in the MSR.
Figure 2-12: Workstation 5 System Board Magnetic Stripe Interface
