IF MODEM IS INSTALLED AND TO BE USED, connect TIP and RING phone
connections to the Terminal Strip or Modular Phone Jack at 
Option Port 1.  Polarity is not critical.

For normal use of Thermocouple Input Channels, ensure that a wire
jumper is installed accross the INT terminals of the CJC Terminal Strip.

If an external power source is to be used, connect the low-voltage 
AC or DC source (9 to 16 VDC/VAC) to the EXT PWR Terminal Strip.
The HL will run from its internal batteries unless the External Power
source exceeds the battery voltage by approximately 2 volts.
