Development Adapters

#100 - RS-232 adapter (2 RX + 2 TX) for utility analog modem card 
       Plugs into Molex connector on modified modem card to allow 
       an external modem or PC to be connected. 
 
#110 - RS-232 adapter for utility cellular modem.  Permits an external 
       modem or PC to be connected in place of the Ericsson DM-15 modem 
 
#120 - Power supply and interconnect board.  2 pin connector is for #121 
       cable, which takes 5-30 VDC in, regulates to 3.3V.  3 pin connector 
       is for #122 cable, which connects to PC.  4 pin connector is for  
       #123 cable (connected to optional #124 card), which supplies 3.3 
       VDC and ground to a Sipex or Maxim MAX-232A chip, and connects the 
       center two pins to pins 2 & 3 of the #122 cable.  Typically used 
       for level shifting a TX + RX pair to a PC, or monitor a combined 
       TX + RX pair (with the #124 card) 
 
#121 - 2 pin Molex connector to banana plugs.  Used to supply power to  
       the #120 card. 
 
#122 - 3 pin Molex connector to DB-25.  Has ground, TX and RX.  Used to 
       connect the #120 card to a PC. 
 
#123 - 4 pin Molex to 4 pin something.  Used to connect #120 card to  
       #124 card. 
 
#124 - Has two TTL inputs that are connected to TTL level TX and RX lines 
       (such as a modem, or interprocessor communications).  These lines 
       are OR'ed together, level shifted to RS-232, and sent back to the 
       #120 card to be monitored by a PC.  The TX line from the #120 card 
       is not connected. 
 
#125 - Same as #122 cable, only TX and RX pins are reversed.  Can't 
       remember what it's supposed to connect to. 
 
#126 - Used to connect Skateboard 24 pin connector to #100 adapter.