HP QMS 1660 Return, Direction

Cable Pinouts

Notes to the Table

nDirection refers to the direction of signal flow as viewed from the printer.

nReturn denotes “twisted-pair return” and is to be connected at signal-ground level. When wiring the interface, be sure to use a twisted-pair cable for each signal and never fail to complete con- nection on the return side. To prevent noise effectively, these cables should be shielded and connected to the chassis of the system unit and printer, respectively.

nAll interface conditions are based on Transistor-Transistor Logic (TTL) level. Both the rise and fall times of each signal must be less than 0.2 microseconds.

nData transfer must be carried out by recognizing the ACKNLG or BUSY signal.

nThe cable must have an overall braided shield, Belden 8345 or equivalent.

nConnectors must have shielded housings. The overall shield must be bonded to the shielded housings at both ends of the cable.

B-8 QMS 1660 Print System Reference