FRASER'S HILL
FHL-7123
USER REFERENCE MANUAL
Revision 1.02

Copyright © Fraser's Hill Ltd. 1990-1993. All Rights Reserved.
Fraser's Hill and FHL are registered trademarks of Fraser's Hill Ltd.

HARDWARE CONFIGURATION

The FHL-7123 has one switch and five jumper blocks which are used to configure the board. These switches and jumpers are located as follows.

S1: PC I/O Base Address
J1: PC Interrupt Request Level
J2: PC Interrupt Enable
J3: PC DMA Channel 1 Enable
J4: Modem Power
J5: PC IRQ Sharing
V.24/RS-232C Signals

S1 - PC I/O BASE ADDRESS

Switch S1 sets the base PC I/O address for accessing the FHL-7123 adapter card. The following table lists the valid switch settings and the corresponding PC I/O base address.

position         1       2       3       4      i/o
address bit     A8      A7      A6      A5      addr

                on      on      on      on      0200
                on      on      on      off     0220
                on      on      off     on      0240
                on      on      off     off     0260
                on      off     on      on      0280
                on      off     on      off     02A0
                on      off     off     on      ----
                on      off     off     off     ----
                off     on      on      on      0300
                off     on      on      off     0320
                off     on      off     on      0340
                off     on      off     off     0360
                off     off     on      on      0380
                off     off     on      off     03A0
                off     off     off     on      ----
                off     off     off     off     ----

position        5       6           i/o    default   serial
                                    addr     IRQ      port

                off     off         03F8      4       COM1
                off     on          02F8      3       COM2
                on      off         03E8      4       COM3
                on      on          02E8      3       COM4

This jumper selects the PC IRQ used when the board microcode wants to interrupt the PC. Choices are IRQ2, IRQ3, IRQ4, IRQ5, and IRQ7.

J2 - PC INTERRUPT ENABLE

This jumper controls the enabling of the PC interrupt request level selected by jumper J1. When the shunt is installed on the top two pins the software can enable and disable the PC Interrupts. When the shunt is installed on the bottom two pins the PC interrupts are always enabled. This second option should be used with any software not supplied by Fraser's Hill.

J3 - PC DMA CHANNEL 1 ENABLE

This jumper controls the enabling of DMA channel 1. When the shunt is installed on the top two pins the software can enable and disable DMA channel 1. When the shunt is installed on the bottom two pins DMA channel 1 is always enabled. This second option should be used with any software not supplied by Fraser's Hill. DMA channel 3 can only be enabled by the software.

J4 - MODEM POWER

A three position jumper selects an optional regulated +9 volt DC power source on one of two V.24/RS-232 pins. Installing the shunt on positions 1-2 enables this power source on V.24 pin 9, installing the shunt on positions 2-3 enables this power source on V.24 pin 25, removing the shunt disables this feature. The maximum current used should not exceed 0.5 amps.

J5 - PC IRQ SHARING

When this shunt is installed the FHL-7123 asynchronous port will use the IRQ selected by J1 for the synchronous port instead of the default interrupt request level selected by switch S1 positions 5-6. When this shunt is not installed the asynchronous port will use the default interrupt request level for the serial port selected by switch S1 positions 5-6.

V.24/RS-232C SIGNALS

PRIMARY CHANNEL

       SIGNAL    CIRCUIT    PIN      I/O

        TXD        103       02      OUT
        RXD        104       03      IN
        RTS        105       04      OUT
        CTS        106       05      IN
        DSR        107       06      IN
        DTR        108       20      OUT
        DCD        109       08      IN
        SCTE       113       24      OUT
        TXC        114       15      IN
        RXC        115       17      IN
        RI         125       22      IN