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5-4 ADVANCED OPERATION GUIDE
* Indicates signals that are low active.
** The Paper Empty, Online, and Error signals work only after you have enabled them using the O2
parameter of the FRPO command.
10 Out Acknowledge* [nAck] This negative-going pulse acknowledges the previous
character received.
11 Out Busy [Busy] When this signal is high, the printer is busy. When it is low,
the printer is able to receive more data.
12 Out Paper Empty
[PError]
This signal goes high when the printer runs out of paper.**
13 Out Online (Select) [Select] This signal goes high when the printer is online and low
when the printer is offline. The signal goes low when you
press [GO] to make the printer go off line.**
14 In — [nAutoFd] Ignored
15 —— Not used
16 —0 V DC
17 — Chassis Ground
18 — +5 V DC This pin is used for the printer’s +5 V DC power supply
(+5±0.5 V, 400 mA maximum, with fuse)
19 — Ground return
20 — Ground return
21 — Ground return
22 — Ground return
23 — Ground return
24 — Ground return
25 — Ground return
26 — Ground return
27 — Ground return
28 — Ground return
29 — Ground return
30 — Ground return
31 In — [nInit] Ignored
32 Out Error* [nFault] When the high-speed parallel line control is on, this line
returns an error status.**
33 —— Not used
34 —— Not used
35 Out Power Ready This signal goes high when the printer is powered on.
36 In Select In [nSelect In] When this line is high, IEEE1284 mode is enabled.
Pin
In or
out
Signal Description