Unit installation

7-9

138: Direct SPI Send out of Radio Card's Serial Port

This command is provided only for advanced use controlling SPI devices. Unless you need to

control a serial shift register or perform a direct transfer to the Doug Hall RBI-1, ignore this

command. This command accepts data in hex (two digits per byte) and sends that data in an SPI

format (with data and clock line) out the serial port on one of the radio cards. This command

requires that socket U8 be empty and that jumpers be installed on J5 on that radio card.

<138> p xx Send individual byte out radio card

<138> p xx..xx Send multiple bytes out radio card

Parameters:

- 138 is the default command name.

- P is the radio card to send the SPI data out of

- XX is the hex number (00..FF) representing a byte of data to send. To send codes with 'E'

or 'F', you will have to enter this command from the serial port. You may

have to change your force execution digit (see command 078) to be able to

enter some hex codes. You must enter an even number of XX digits since it

takes two hex digits to make one byte of data.

Notes:

External shift registers like the 74HC164 will decode the shifted data and return it to 1's and

0's for external BCD radio control.

Each hex digit entered corresponds with four binary digits. If you are sending only digits

0..9, they can be used as BCD data.

Key Entered Data Sent . Key Entered Data Send

0 0000 . 8 1000

1 0001 . 9 1001

2 0010 . A 1010

3 0011 . B 1011

4 0100 . C 1100

5 0101 . D 1101

6 0110 . E 1110

7 0111 . F 1111