2-26
Workstation 5 Field Service Guide
Workstation 5 System Board Technical Descriptions
Point Of Sale Interfaces
IDN Port (REF: ABRD88 - Sheets 16, 32, and 33)
The IDN Port is a multi-purpose RS422/232 port based on an 8-Pin RJ-45
modular connector. This port is functionally identical to the RS422-A and
RS422-B ports on the Workstation 4 and 4 LX, the PCWS 2010 ‘COM4 IDN’
Port and the PCWS Eclipse ‘IDN/LCC’ port.
Figure 2-13, below displays a simplified block diagram of the IDN portion of
this interface. A logic diagram of the 75176 is also shown to point out how
each device contains a transmitter and receiver with separate enables. The
RS232 interface can be found on the next page.
Figure 2-13: Workstation 5 System Board IDN Port Interface
UART 1 in the CS5536 Companion Chip is dedicated to the IDN Port and
assigned to COM4. Several GPIO signals from Super IO #1 supply the logic
control signals.
