COM4N to COM4 Reversion Procedure

If it is necessary to revert from the network option back to standard (non-network), the COM4N must be converted back to standard as well. The network option required shared interrupts and standard uses unique interrupts for each port. The non-network version of the hardware will not operate with shared interrupts.

Required Materials and Tools

Upgrade Parts Required

• IRQ cable (3 connector, CBL-151-1124F)
  
• “COM4” ejector tab
  

Tools/supplies Required

• Flat blade screwdriver
  
• Antistatic (ESD) wrist strap 
  
• Wire-wrap tool 
  
• 30ga wire-wrap wire

NOTE	Non-network version of the hardware will not operate with shared interrupts.

Caution

Follow proper antistatic precautions when handling the boards.

 

Procedure to Revert a COM4N Board from Shared Interrupts Back to Individual Interrupts

1. Remove all jumpers from J15, J16 and J17.

2. Add the following jumpers. Refer to figure 1 for location:

J16	3-4
J17	1-2 3-7

3. The Hardware Watchdog MUST be enabled. Verify the jumper J18 is installed.

4. Remove the COM4N ejector tab (held with press-pin) and replace with a COM4A tab or remove COM4N label.

5. Replace 2-position IRQ cable, CBL-151-1124G, with 3-position IRQ cable, CBL-151-1124F.

Figure 1: COM4A board