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Interfacing
96
SG ... SIGNAL GROUND
• The twisted pair return wires (pins 19-30) are connected to signal ground.
FG ... FRAME GROUND
• Frame ground is the same as chassis ground.
+5V
• This is for evaluation only. It should not be used to supply power for external equipment.
PRIME
• This input signal is normally high and goes low to reset the printer. It can be received anytime during
printer operation.
ERROR
• This output signal is normally high, and goes low when an error occurs. An error condition can be
caused by:
,.
A "Paper Out" condition
2.
The 'printer is OFF LINE
3.
An overload condition exists
Timing Chart (When normal printing code is received)
Timing diagram
DATA
1~
STB
f - -
BUSY
I
ACK
-
T1~
T3
I-
.--JJ
Tl ... 0.S
~s
(Min)
T2 ... 1
~s
(Min)
T3 ... 0.S
~s
(Min)
T4 ... S
~s
(Max)
TS ... 1 ms or less when buffer is not full
1 s or less when buffer is full
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