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PCI Quad 422/485 Card Chapter 4 DOS Software Configration
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/I IRQ, range specifies card interrupt and COM port range. The COM port range
specifies the COM port(s). Range may be a single port OR a range of ports.
/B number buffer is used to set the number of pairs of buffers to be allocated to
ports and is a decimal number in the range 1-maxport.
/S buffer Set size of all buffers in bytes, buffer is rounded to the nearest power
of 2 and must be a decimal number in the range 32 to 32768. For any serial port
opened two buffers of size buffer are allocated, one for input and the other for
output.
/H hardware handshake selects which hardware handshake type to use on the
specified ports. This is used in the following manner: /H range, hs where range
specifies the COM port or ports and hs selects handshake type. Handshake types
available are:
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 serial device needs a true
signal.
Type 3
RS485 Send only - This is a half duplex, transmit only
handshake. The PC transmits whenever it wishes, it cannot receive any data. The
CTS, 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 4
3 Wire Handshake - Really no handshake at all since the PC
transmits irrespective of the handshake lines. The 3 wires are TxD, RxD and
Ground, no other lines are required. Thus the CTS, DSR and DCD inputs are
ignored. The RTS and DTR output lines are set true just in case the external
serial device needs a true signal.
Note: If hardware handshaking is not specified in the NEWCOM.SYS
parameters, type 4, 3 Wire Handshake is selected automatically.
Configuring And Installing NEWCOM.SYS
To load the Serial Solutions for DOS device driver an entry needs to be added to
the CONFIG.SYS file. Any simple text editor, EDIT for example, can edit the
CONFIG.SYS file for example. The installation procedure given below is for a
PCI RS422/485 as COM 5-8.
The parameter required by the NEWCOM.SYS driver are those returned by the
BBCARDS.EXE application earlier. A brief explanation for the parameters
required by NEWCOM.SYS follows:
Port Address.
/A5-8,0140
COM ports 5,6,7 and 8 are defined, with an i/o address range that begins at
0140h and all subsequent ports have an i/o address that is 8 higher than the