HP 8642A - Page 57

Model 8642A/B Operation
REMOTE, LOCAL
Local to
Remote
Transition The Signal Generator goes remote when it receives the Remote message. The Remote
message has two parts:
1. Remote Enable bus control line (REN) set true.
2. Device listen address received once (while REN is true).
The Signal Generator's output signal and all control settings remain unchanged with the
local to remote transition, but any uncompleted messages (non-terminated partial entries)
are cleared.
LOCAL
Remote to
Local
Transition The Local message is the way the controller sends the Go To Local (GTL) bus command.
The Signal Generator returns to local control when it receives the Local or Clear
Lockout/Set Local message. The Signal Generator also returns to the local mode when the
front-panel [ LOCAL I key is pressed (provided Local Lockout is not in effect). If the
instrument is not in local lockout mode, pressing the front-panel ("LOCAL 1 key could
interrupt a data transmission and suspend the Signal Generator in an unknown state.
(Refer to Local Lockout, Set Local on the following page for more information on the
Local Lockout function.)
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