Maximum serial PORTswitch 900FP lines on system is PORTswitch 900FP. The Base Hardware System (Step 1) includes two serial lines. This leaves a maximum of 24 additional asynchronous serial lines to choose as options. PORTswitch 900FP M 8 serial lines - Choose up to three if no other ? CK PORTswitch 900FP VB Cabinet kit with no modern - - asynchronous options are selected. control, PORTswitch 900FP signalling DHV11 is not currently supported on supporting 8 remote 25-pin RT 11, CTS 300, or MicroPower/Pascal-RT. - - connections - PORTswitch 900FP M - 8 serial lines Choose only one if no other asynchronous ? CK PORTswitch 900FP AB Cabinet kit with full modem - - options are selected. DHV II is not control, RS232 signalling currently supported on supporting 8 25-pin connections RT 11, CTS 300, or PORTswitch 900FP /Pascal-RT. - - on the bulkhead ? DHV11 M - 8 serial lines Choose up to three if no other CK PORTswitch 900FP WB Cabinet kit with no modern - - asynchronous options are selected. control, RS423 signalling DHV 11 is not currently supported on supporting 8 remote MMJ RT 11, CTS 300, or PORTswitch 900FP /Pascal-RT. - - PORTswitch 900FP connections 4 serial lines Choose up to three if no other ? CK PORTswitch 900FP DB Cabinet kit with full modern - - asynchronous options are selected. control, PORTswitch 900FP signalling supporting 4 25-pin connections