Technical information

Newcom Parameters Serial Solutions
Hardware Handshake.
Switch: /H [range],[hs]
Purpose:
Select which hardware handshake type to use on the
specified ports. Hardware handshake is flow control of data
determined by the state of various lines in the port
connector. See chapter "What To Do First", section
"Handshake Selection" for more information.
’range’
specifies the COM port. Range may be a SINGLE port OR
a RANGE of ports. If range is not specified the handshake
is applied to all serial ports.
’hs’ is a number indicating the type of handshake, and 4 is the
default. This does not override a previous XON/XOFF___
setting, in conjunction with which it may be used. The
types are listed below.
The hardware handshake currently supported are:
Type 0 RS232 DTR/CTS
The PC only transmits when CTS is input true. When
the PC is able to receive its sets DTR output true.
The DSR and DCD inputs are ignored. The RTS
output line is set true just in case the external serial
device needs a true signal.
Type 1 RS422 RTS/CTS
The PC only transmits when CTS is input true. When
the PC is able to receive its sets RTS output true.
The DSR and DCD inputs are ignored. The DTR
output line is set true just in case the external serial
device needs a true signal.
Type 2 RS485 Half duplex
Before any data is sent the PC sets RTS true, after
the last byte in the buffer has been sent the PC sets
RTS false. RTS is used as a transmit gating control.
The CTS, DSR and DCD inputs are ignored. The
DTR output line is set true just in case the external
Chapter 2 Page 25