Diamond Systems JUPITER-MM-SIO Podręcznik użytkownika - Strona 11

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Interrupt Status Register

The interrupt status register indicates the status of each port's interrupt request line. It operates regardless of

whether interrupt sharing is enabled (see below). If two or more ports are sharing the same interrupt level, the

status register will still indicate the correct status of each port's interrupt request line.

Bit No.

Name

Definitions:

Bit not used; generally reads back as a 1

INT2-1

Status of interrupt request for each port:

0 = no interrupt request active for this port

1 = interrupt request active for this port

Default Settings

The default settings for Jupiter-MM-SIO are as follows:

Protocol settings:

Both ports set for RS-232 protocol (Jumpers 2 and 5 installed in locations J7 and J8)

Address/Interrupt settings:

(J9 A B C = In In Out):

Feature

Port 1

Port 2

Interrupt Status

RS-485 Transmitter Control

In an RS-485 network, the same pair of wires is used for both transmit and receive signals. Although any number

of nodes can be listening simultaneously, only one can be transmitting or have its transmitter turned on in order

for valid data to be transmitted across the network. On the Jupiter-MM-SIO, an RS-485 port's transmitter enable

signal is controlled by that port's RTS signal. The RTS signal must be asserted (driven low) to enable the

transmitter and deasserted (driven high) to turn off the transmitter.

Address

Interrupt level

100

108

3 (shared)

240

INT2

Jupiter-MM-SIO User Manual V1.3

INT1

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