00416nam a2200133Ia 4500008004100000041000800041082001500049100001500064245012100079260004300200300000800243365001600251700001500267230718s9999    xx            000 0 und d  aeng  a004.6bAXE  aAxelson J.  aSerial Port Complete Programming And CircuitsbProgramming And Circuits For Rs.- 232 And Rs - 485 Links And Networks  c1998bPenram International Publication  a306  cRs.b300.00  aAxelson J.