Filter
Top Products
Data Cable Wiring
RS-485 SignalPin Connection
Ain/out+ 2
Ain/out- 3
100 Ω to Ground 5
Baud Rate Ranges
The jumper labeled CLK X8 provides a means to select baud rates in a higher range. When a jumper is
not placed on the out the CLK X8 position, the baud rate range is up to 115,200 baud. When it is in the
CLK X8 position, the baud rate range is up to 921,600 baud.
Interrupts
Please note that, in WindowsNT, changes must be made to the system registry to support IRQ sharing.
The following is excerpted from "Controlling Multiport Serial I/O Cards" provided by Microsoft in the
MSDN library, documentid:mk:@ivt:nt40res/D15/S55FC.HTM, also available in the WindowsNT Resource
Kit.
The Microsoft serial driver can be used to control many dumb multiport serial cards. Dumb indicates that
the control includes no on-board processor. Each port of a multiport card has a separate subkey under
the HKLM\CurrentControlSet\Services\Serial subkey in the registry. In each of these subkeys, you must
add values for DosDevices, Interrupt, InterruptStatus, PortAddress, and PortIndex because these are
not detected by the Hardware Recognizer. (For descriptions and ranges for these values, see
Regentry.hlp, the Registry help file on the WindowsNT Workstation Resource Kit CD.)
For example, if you have an eight-port card configured to use address 0xFC00 with an interrupt of 05, the
values in the Registry are:
Serial2 subkey:
PortAddress = REG_DWORD 0xFC00
Interrupt = REG_DWORD 5
DosDevices = REG_SZ COM3
InterruptStatus = REG_DWORD 0xFC40
PortIndex = REG_DWORD 1
Indexed = REG_DWORD 0
Serial3 subkey:
PortAddress = REG_DWORD 0xFC08
Interrupt = REG_DWORD 5
DosDevices = REG_SZ COM4
InterruptStatus = REG_DWORD 0xFC40
PortIndex = REG_DWORD 2
Indexed = REG_DWORD 0
Serial4 subkey:
PortAddress = REG_DWORD 0xFC10
Interrupt = REG_DWORD 5
DosDevices = REG_SZ COM5
InterruptStatus = REG_DWORD 0xFC40
PortIndex = REG_DWORD 3
Indexed = REG_DWORD 0
Serial5 subkey:
PortAddress = REG_DWORD 0xFC18
Interrupt = REG_DWORD 5
DosDevices = REG_SZ COM6
InterruptStatus = REG_DWORD 0xFC40
PortIndex = REG_DWORD 4
Indexed = REG_DWORD 0
Serial6 subkey:
PortAddress = REG_DWORD 0xFC20
Interrupt = REG_DWORD 5
DosDevices = REG_SZ COM7
InterruptStatus = REG_DWORD 0xFC40
PortIndex = REG_DWORD 5
Indexed = REG_DWORD 0
Serial7 subkey:
PortAddress = REG_DWORD 0xFC28
Interrupt = REG_DWORD 5
DosDevices = REG_SZ COM8
InterruptStatus = REG_DWORD 0xFC40
PortIndex = REG_DWORD 6
Indexed = REG_DWORD 0
Serial8 subkey:
PortAddress = REG_DWORD 0xFC30
Interrupt = REG_DWORD 5
DosDevices = REG_SZ COM9
InterruptStatus = REG_DWORD 0xFC40
PortIndex = REG_DWORD 7
Indexed = REG_DWORD 0
Serial9 subkey:
PortAddress = REG_DWORD 0xFC38
Interrupt = REG_DWORD 5
DosDevices = REG_SZ COM10
InterruptStatus = REG_DWORD 0xFC40
PortIndex = REG_DWORD 8
Indexed = REG_DWORD 0
Manual LPCI-COM-8SM
13