11713A Operating and Service Manual 8-19
Servicing the Attenuator/Switch Driver
Troubleshooting the A5 Handshake and Data Input Assembly
The bus logic performs the following functions:
• accepts inputs from the data input/output (DIO) lines and the
attention (ATN) signal from the interface bus. These inputs, in
conjunction with the HS OUT signal, enable the remote/local logic
and the local lockout logic.
• processes the attenuator/switch state codes and select codes present
on the DIO lines. It then combines them with handshake out (HS
OUT) and remote signals to output the NCLK signal from U11A on
the A4 remote /local assembly.
• places the driver into remote operation or local operation on
command from the interface bus in conjunction with the remote/local
logic.
