Spectrum Brands MI.20xx - Manual (Page 82)

82 MI.20xx Manual
Digital I/Os Option Extra I/O
Option Extra I/O
Digital I/Os
With this simple-to-use enhancement it is possible to control a wide range of external instruments or other equipment. Therefore you have
several digital I/Os and the 4 analog outputs available. All extra I/O lines are completely independent from the board’s function, data di-
rection or sample rate and directly controlled by software (asynchronous I/Os).
The extra I/O option is useful if an external amplifier should be controlled, any kind of signal source must be programmed, an antenna must
be adjusted, a status information from external machine has to be obtained or different test signals have to be routed to the board.
It is not possible to use this option together with the star hub or timestamp option, because there is just space
for one piggyback module on the on-board expansion slot.
Channel direction
Option -XMF (external connector)
The additional inputs and outputs are mounted on an extra bracket.
The direction of the 24 available digital lines can be programmed for every group of eight lines. The table below shows the direction register
and the possible values. To combine the values so simply have to OR them bitwise.
Option -XIO (internal connector)
The additional inputs and outputs are available through an internal connector directely on the extra I/O piggiback module.
The direction of the 16 available digital lines can be programmed for every group of eight lines. The table below shows the direction register
and the possible values. To combine the values so simply have to OR them bitwise.
Transfer Data
The outputs can be written or read by a single 32 bit register. If the register is read, the actual pin data will be taken. Therefore reading the
data of outputs gives back the generated pattern. The single bits of the digital I/O lines correspond with the bitnumber of the 32 bit register.
Values written to the most significant byte will be ignored.
Register Value Direction Description
SPC_XIO_DIRECTION 47100 r/w Defines bytewise the direction of the digital I/O lines. The values can be combined by a bitwise OR.
XD_CH0_INPUT 0 Sets the direction of channel 0 (bit D7…D0) to input.
XD_CH1_INPUT 0 Sets the direction of channel 1 (bit D15…D8) to input.
XD_CH2_INPUT 0 Sets the direction of channel 2 (bit D23…D16) to input.
XD_CH0_OUTPUT 1 Sets the direction of channel 0 (bit D7…D0) to output.
XD_CH1_OUTPUT 2 Sets the direction of channel 1 (bit D15…D8) to output.
XD_CH2_OUTPUT 4 Sets the direction of channel 2 (bit D23…D16) to output.
Register Value Direction Description
SPC_XIO_DIRECTION 47100 r/w Defines bytewise the direction of the digital I/O lines. The values can be combined by a bitwise OR.
XD_CH0_INPUT 0 Sets the direction of channel 0 (bit D7…D0) to input.
XD_CH1_INPUT 0 Sets the direction of channel 1 (bit D15…D8) to input.
XD_CH0_OUTPUT 1 Sets the direction of channel 0 (bit D7…D0) to output.
XD_CH1_OUTPUT 2 Sets the direction of channel 1 (bit D15…D8) to output.
Register Value Direction Description
SPC_XIO_DIGITALIO 47110 r Reads the data directly from the pins of all digital I/O lines either if they are declared as inputs or
outputs.
SPC_XIO_DIGITALIO 47110 w Writes the data to all digital I/O lines that are declared as outputs. Bytes that are declared as inputs
will ignore the written data.