Reaction To Interface Commands And Messages; Addressing The Plotter - HP 7470A Interfacing And Programming Manual

Function Description Implementation
TEO Extended talker. No capability.
C0 Controller. No capability.
DCO Device clear. No capability.
DTO Device trigger. ,, No capability.
PPO Parallel poll. No capability.
SRO Service request. No capability.
AA1 Auto address. Complete capability.
AEO Auto extended No capability.
address.
AMO Auto multiple No capability.
address.
RLO Remote local. No capability.
PDO Power down. No capability.
DDO Device dependent No capability.
commands.
Reaction to Interface Commands
and Messages
All unsupported interface commands are ignored and retransmitted
around the loop. Upon receipt of the interface clear (IFC) message, the
plotter resets the parser and starts looking for a new HP—GL instruction.
Any partially parsed HP—GL instruction or parameters will be lost. This
message does not reset parameters in the plotter to their default values.
Addressing the Plotter
The default address of the plotter is 5. However, the plotter address in a
program may vary; this is because the system controller generally
assigns addresses automatically in a sequential manner around the
loop. Refer to your computer's documentation for hints on writing
programs so that they will run no matter what order the peripheral
devices are interconnected. The examples in this chapter assume that
the plotter is the only device connected to the computer. Therefore, the
plotter's address is 1.
HP—lL INTERFACING 11~3