Lexmark C720 Technical Reference - Page 307
Table 8-1: Parallel Connector Pin Assignments, not exceed 3.04 m 10 ft
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8-9 Interfaces • To prevent line noise, the cables should be shielded and connected to the chassis of both the computer and the printer. The parallel cable length should not exceed 3.04 m (10 ft), unless a Lexmark 6.1 m (20 ft) parallel cable is used. Table 8-1: Parallel Connector Pin Assignments Pin IEEE 1284-B Connector IEEE 1284-C Connector Signal 1 15 STROBE* Inverted logic: signal is active when low 2-9 6-13 DATA0 through DATA7 10 3 11 1 ACKNLG* Inverted logic: signal is active when low BUSY 12 5 13 2 PE SLCT N/A means non-applicable. Direction Description In The computer generates this signal to allow the printer to read in data. The signal level is normally high: data is sampled at the falling edge of this pulse. In/Out Out These signals represent data bits 0 to 7, respectively. Each signal is at a high level when data is logical 1, and low when data is logical 0. Pin 2 is the least significant bit. Note: Data is driven out only when the printer is in IEEE 1284 Byte or ECP modes. This negative pulse indicates the printer can again accept data. Out A high signal indicates the printer cannot receive data. The signal is high: • During initialization • During data sampling • When the buffer is full • In the not ready state • During a printer error A low signal indicates the printer is not busy and the computer can again send data. Out Paper Exception signal indicates no paper is loaded, a paper jam exists, or a paper feed error occurred. Out Select signal indicates the printer is selected and is online. This signal is normally active. It becomes inactive when the printer is offline.