User guide Interfaces122Parallel interface The bidirectional parallel interface offers the so called “nibble” modeof the IEEE1284 interface norm. This enables installation in accor-dance with Windows “Plug & Play”.The standard parallel interface is able to transfer data at a speed ofmax. 30,000 bytes per second. When the receiving buffer is full, thedata input is blocked until the data buffer is empty. This guaranteesdata transmission in blocks of 1 KB.Connector assignmentTransmission length: max. 2,0 mConnector no. DirectionPrinter–PC Signal1 ← STROBE (active low)2 ← DATA 13 ← DATA 24 ← DATA 35 ← DATA 46 ← DATA 57 ← DATA 68 ← DATA 79 ← DATA 810 → ACK (active low)11 ↔ BUSY12 ↔ PAPER EMPTY (PE)13 ↔ SELECT14 ↔ AUTO FEED (active low)15 not used16 – SIGNAL GROUND17 – CHASSIS GROUND18 – 5 V (Imax = 500 mA)19–30 – SIGNAL GROUND31 ← INIT (active low)32 ↔ ERROR (active low)33 – SIGNAL GROUND34–35 not used36 ← SELECT IN18 11936
