Xerox WORKCENTRE 7120 Panduan Referensi - Halaman 20

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1. General Description

Time (in milliseconds)

Event

100

110

120

130

140

150

--,---.-------Card reader receives valid read order and reader is in "busy automatic" state. Light check

occurs at this time. If light check fails, the read indicator will light, the reader will switch

to "not operational

and an "unusual end" will be signaled to the controlling system.

--I---lr----------Column 1 arrives at read station. Mode change (EBCDIC to binary) will occur at this time if

rows 1 and 2 are punched.

-t-~------

Column 80 arrives at read station.

--I--~®

End of card is detected; card reader signals "channel end" to controlling system. Card reader

returns to "ready" condition (a new SIO can be accepted if no interrupt is pending) unless the con-

troll ing system specifies command chaining, in which case the reader requests a new read order.

....... , - - - - - - - - N e w feed cycle enabled at this time if new valid order present and reader still in "automatic"

mode.

Notes:

Feed cycle is approximately 27 ms if card feeds on first attempt, approximately 87 ms if card feeds on

second attempt, and approximately 147 ms if card feeds on third attempt. If a card has not been fed after

three attempts, the transport motor will halt, the reader will switch to "not operational", the FEED

indicator will light, and an "unusual end" will be signaled to the controlling system.

The data bytes are transmitted, with respect to the column read time (approximately 1.12 ms), as shown below.

1-1.12 ms-I-98 ms-I

Data available to controlling system

EBCDIC mode: Transmit one byte

for each column

~~-----,n~_---,nL----_

-----'n~_----Jr1Jl

nL----_

Binary mode: Transmit rows 12-5 _ _ _ _ . . . . . . .

Store rows 6-9

'-----Transmit rows 2-9

Transmit rows 12-1 plus

rows 6-9 of previous column

indicates data overrun will occur at this time if data is not accepted by controlling system.

Throat jam detection occurs 125 ms later if card jams in throat area, causing transport motor to halt, FEED

indicator to light, reader to switch to "not operational

II ,

and an "unusual end" to be signaled to the

controlling system.

Read and timing jam detection occurs 125 ms later if card jams in read and timing area. Results in same

action as

above.

Dark check occurs at this time. If dark check fails, the READ indicator will light, the reader will switch

to "not operational", and an "unusual end" will be signaled to the controlling system.

Stacker jam detection occurs 125ms later if card jams in stacker area. Results in same action as

above.

Figure 6. Card Reader Event Times (Model 7122)

Programming Considerations