Epson DFX 8500 Service Manual page 28

DFX-8500
0 Signal Level: 'TTL-level compatible, IEEE-1284 level 1 device
Refer to Table 1-9.
Note:
l
A low Iogic level on the logical high signal is 2.0 V or less when the printer is powered off.
And this signal is equal or exceeding 3.0 V when the printer is powered on. The receiver
shall provide an impedance equivalent to 7.5 K ohms to ground.
0 Connector pin assignments and signals: Refer to Table l-10.
signal on this line causes the printer to initialize.
Note: *In/Out refers to the direction of signal flow from the printer's point of view.