Best Power Technology Fortress - Communication Port Pinouts
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                        Fortress DB-9  
                    Advanced Mode (default)
                   (setpoint 7 = 1,2,3, or 4)
		  1 = advanced mode at 1200 Baud (default)
                  2 = advanced mode at 2400 Baud
                  3 = advanced mode at 4800 Baud
                  4 = advanced mode at 9600 Baud

Pin		          Description
---     ---------------------------------------------------------------
 1      Receive Data      
 2      Transmit Data
 3      Inverter Normally Open Contact - Closes to indicate that
        the UPS is on battery power.
 4      Common - Signal ground for all interface signals and contacts.
 5      Low Runtime Normally Open Contact - Closes to indicate that
        runtime (battery reserve while in inverter) is low.
 6      Inverter Normally Closed Contact - Opens to indicate that
        the UPS is on battery power.
 7      Remote Emergency Power Off - Short to ground to turn the UPS off.
        Apply +12VDC to turn the UPS back on or connect to Pin 8.
 8      Unregulated +24VDC Source. (Current limited to 10mA typical).
 9      Chassis Ground        

The "Advanced Mode" is the default mode. It provides true asyncronous
serial communications support for Best CheckUPS and CheckUPS/II.

The "Contacts" consist of open collector circuits capable of switching
up to a +40 VDC 50mA resisitive load.      
 
The "RS232 Communications Port" connections are found on Pin 4 (signal 
ground), Pin 1 (receive data), and Pin 2 (transmit data). This port is 
configured as DCE operating at 1200 baud (selectable 1200, 4800, or 
9600). Data is formated in 8 bit ASCII; 1 stop bit; full duplex; no parity. 
This interface supports XON/XOFF. Hardware handshaking is not supported. 
Refer to FTS501 for information regarding the Fortress Command Language.

Fortress Cable connections to a computer or terminal:
-----------------------------------------------------
Computer                        Fortress	 
  DB-9                           DB-9
  DCE                            DCE
--------                        -------
  TD 2 <------------------------> 2
  RD 3 <------------------------> 1
  SG 5 <------------------------> 4
  NC 	------------------------> case 
 (NC not connected, acts as a single sided shield)

 GND 1 <-----\
 DCD 4 <-----|
 DTR 6 <-----/

 RTS 7 <-----\
 CTS 8 <-----/
 
----------------------------------------------------
Computer                        Fortress	 
  DB-25                          DB-9
  DTE                            DCE
--------                        -------
  TD 2 <------------------------> 1
  RD 3 <------------------------> 2
  SG 7 <------------------------> 4
  NC 	------------------------> case 
 (NC not connected, acts as a single sided shield)
 
 RTS 4 <-----\
 CTS 5 <-----/

 DSR 6 <-----\
 DCD 8 <-----|
 DTR 20 <----/

----------------------------------------------------
  Modem                         Fortress	 
  DB-25                          DB-9
  DCE                            DCE
--------                        -------
  RD 3 <------------------------> 1
  TD 2 <------------------------> 2
  SG 7 <------------------------> 4
   NC 	------------------------> case 
 (NC not connected, acts as a single sided shield)

 RTS 4 <-----\
 CTS 5 <-----/

 DSR 6 <-----\
 DCD 8 <-----|
 DTR 20 <----/
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                        Fortress DB-9  
                         Contact Mode
                       (setpoint 7 = 0)
Pin		          Description
---     ---------------------------------------------------------------
 1      Shutdown - A +12VDC signal held for 5 seconds on this pin while
        the UPS is on battery shuts doen the UPS 20 seconds later.
        The UPS will restart after a 10-second delay once normal
        input power is restored.

 2      Inverter Status - Produces a +12VDC signal whenever the UPS
        is on battery power.

 3      Inverter Normally Open Contact - Closes to indicate that
        the UPS is on battery power.

 4      Common - Signal ground for all interface signals and contacts.

 5      Low Runtime Normally Open Contact - Closes to indicate that
        runtime (battery reserve while in inverter) is low.

 6      Inverter Normally Closed Contact - Opens to indicate that
        the UPS is on battery power.

 7      Remote Emergency Power Off - Short to ground to turn the UPS off.
        Apply +12VDC to turn the UPS back on or connect to Pin 8.

 8      Unregulated +24VDC Source. (Current limited to 10mA typical).

 9      Chassis Ground        

The "Contacts" consist of open collector circuits capable of switching
up to a +40 VDC 50mA resisitive load. The "Contact Mode" must be selected
by setting "setpoint 7 = 0" on the front panel. 

This mode is used with the following BEST interface kits: 
      3COM 3+Share - BIK013T
      Banyan VINES - BIK010/011K
      IBM AS/400 - BIK003A
      LAN Manager/Server v2.0 - BIK009L
      Lantastic v4.0 - BIK009L
      Novell UPS.VAP and UPS.NLM - BIK004/005/006N
      Prime 2350/2450 - BIK014P