E497-B (16 optoinsulated Inputs + 16 high current Outputs) ConnectorPPIDescription CN48255_1High current Output channels from O1 to O16 CN38255_2Optoinsulated Input channels from I1 to I8 CN58255_2Optoinsulated Input channels from I9 to I16 For what concern the relation between the ports of both 82C55 and the I/O channels, refer to thefollowing tables. CN4 SignalPinPinSignal A
HC [7]12GND A
HC [6]34GND A
HC [5]56GND A
HC [4]78GND A
HC [3]910GND A
HC [2]1112GND A
HC [1]1314GND A
HC [0]1516GND C
TTL [7]1718GND C
TTL [6]1920GND C
TTL [5]2122GND C
TTL [4]2324GND EXT_V2526GND EXT_V2728GND EXT_V2930GND EXT_V3132GND B
HC [7]3334GND B
HC [6]3536GND B
HC [5]3738GND B
HC [4]3940GND B
HC [3]4142GND B
HC [2]4344GND B
HC [1]4546GND B
HC [0]4748GND VCC4950GND
HC = High current Output The high current outputs have the following circuit scheme:The external power supply (EXT_V) for output drivers must provided through pins 31, 29, 27 and25 of CN4 connector.On CN4 connector are still available the TTL signals of the Port_C_high of the first 82C55. ThenC
TTL [4] to C
TTL [7] are effective still user available. 8