Honeywell 400 Series Hardware Manual page 91

Data Formats
Subsystem States
A feature Of this punch is its standby capability, designed for maximum operating efficiency.
The punch goes from an operate, or normal, state to a standby state (motors Off but power
on) if not called upon to punch cards withina Specified period Of time. The time may lie
within a range of 1/ 2-5 minutes as determined'by the special needs Of the user. The punch
returns automatically to the Operate state as soon as another punch instruction is received.
The operate state exists whenever the subsystem is engaged in punching cards or when it
is actively waiting for an instruction. In this state the punch can handle data in three different
modes--binary, alphanumeric, or edited alphanumeric. The current mode is determined
by the instruction received.
The punch reverts to the standby state whenever it does not receive a punch instruction
within a certain specified periOd of time and there are no existing Attention conditions
or Data Alerts. This time interval may be set anywhere between 0 and 5 minutes, depending
upon the needs of the user. Whenever the specified amount Of time has gone by without
the punch receiving a punch instruction, the Operating mechanism and the motors auto-
matically halt; however, power does not go down. Lights on the Operator's control panel
indicate the change in the subsystem's state. While it is in the standby state, the punch
reflects to the processing system its current status.
Whenever it receives an instruction, within 10 seconds the punch automatically leaves the
standby state and goes into the operate state and the prOper punching mode. Also, the
Operator can manually return the punch to the Operate state by pressing switches on the
subsystem's control panel.
Checking
Reliability Of the punch is guaranteed by a read-after-punch feature. This reading station
examines
the parity of each punched row to determine if the correct number Of holes
has actually been punched.
The following punch conditions are also checked:
Punch ready or busy.
Attention--hopper empty, stacker full, feed alert, card jam, manual halt, chad box
missing or full, or empty prepunch station.
~80-