PCI Quad 422/485 Card
Chapter 4 DOS Software Configration
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previous. i.e. if COM5 has an address of 0140h, then COM6 will have an
address of 0148h, COM7 an address of 0150h etc.
IRQ, Range.
/I 11,5
11 is the IRQ and since the COM port is COM5 is entered 5.
Number Buffer.
/B8 buffers are defined, though only four ports are in use –this is because buffers
in DOS are assigned in a sequential order from COM1. Since the PCI Quad Opto
RS422/485 has been assigned COM port values of 5 to 8, all preceding COM
ports, must have buffers assigned to them also.
Buffer Size.
/S512
Buffer size set to 512 bytes.
Hardware Handshaking.
/H,4
Type 4, 3 Wire Handshake selected for all ports. Type 4, 3 Wire Handshake
selected for all ports.
Modifying Command Line Parameters.
When "assembled" the NEWCOM.SYS command line looks like…
DEVICE=NEWCOM.SYS /A5-8,0140 /I 11,5-8 /B8 /S 512 /H,4
…and should be entered into the CONFIG.SYS file. Once you are sure that these
parameters have been entered correctly, restart your PC and your PCI Quad Opto
RS422/485 Cardshould be ready to use immediately.
