User's Manual

AUXILIARY INPUT/OUTPUT PORT

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234839, Revision 2.2

Auxiliary Input/Output Port

he Auxiliary I/O Port has 8 digital I/O lines. These pins are not associated with the Main or Auxiliary

serial ports, but are used as logical bit inputs or outputs to the modem. These lines are individually

configurable as inputs or outputs and their default state can be configured to preset their power-up state.

The I/O ports can be controlled both remotely and locally through software or by following each other

as if directly connected by wire.

Software control – works by submitting Hayes ‘S’ register commands to the local radio or dialing a

remote radio’s virtual port and submitting the commands to it. The Hayes ‘S’ register commands allow

you full access to configure and control the 8 I/O lines. To software control an Auxiliary port the

‘Enable/Disable Auxiliary I/O’ in the ‘Auxiliary I/O Port Menu’ must be disabled.

Input/Output control – Is the configuration of each of the 8 digital I/O lines as either an input

or an output. The configuration can be done via the menu.

Power-up Output Defaults – allows you to preset the state (High/Low) of an output line when

the radio is first powered up. This prevents devices that are attached to the radios I/O from being

unintentionally enabled.

Sample Rate control – Used to balance the performance of the RFI-9256 between fast updates

from the I/O device for one application and fast serial data throughput for another application. Fast

sample rates below 15ms may degrade serial data throughput when trying to obtain serial data transfer

rates of faster than 50,000 bits per seconds.

Auxiliary I/O Follows Remote – To allow a radio’s outputs to follow the inputs of another radio

the Aux I/O follows remote must be enabled. When two radios are connected for communication in

either a point to point mode or dialup mode, the may also exchange each others input information and

thus reflect the results on their outputs. They must be configured so that the pins that are the input in

one radio are the output on the other. For example, in Figure 10-8, when the modems are connected,

flipping the switch

connected to pin

number 21 in the

Remote Modem will

activated the output

LED connected to pin

21 in the Local modem.

Similarly, Flipping the

switch connected to pin

7 on the Local Modem

will change the status of

the relay attached to pin

7 on the remote

modem.

Figure 10-1 Auxiliary I/O Example