J6
J6 Access to the secondary battery connection and additional serial signals.
The DS1210 NVRAM controller supports two backup batteries.
J6 provides access to the secondary battery.
This should have a jumper between pin 1 and 2 to ground BAT2 if it's not in use.
It makes it possible to use an external battery.
One important purpose of the BAT2 connection, is that the on board battery may be removed for replacement without incurring memory loss, provided that a second battery is temporarily connected to GND and BAT2 on J6.
| J6 Pin | Purpose |
|---|---|
| 1 | Ground |
| 2 | Battery 2 |
| 3 | Serial Ready To Send (RTS) |
| 4 | Serial Data Terminal Ready (DTR) |
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