IEI Integration SRM_121_150 v1.11 - Manual (Page 52)

SRM-121/SRM-150 LCD Monitor
Page 38
4.2.2 Debug Port Connector
CN Label: CN4
CN Type: 4-pin wafer connector
CN Pinouts: See Table 4-5
CN Location: See Figure 4-4
Use the debug port connector to update the AD board BIOS.
PIN DESCRIPTION
1 +5V
2 TX
3 RX
4 GND
Table 4-5: Debug Port Connector Pinouts
Figure 4-4: Debug Port Connector Location