User manual

Bio-inert Quaternary Pump User Manual 175

Hardware Information

Interfaces

• standard TTL levels (0 V is logic true, + 5.0 V is false),

• fan-out is 10,

• input load is 2.2 kOhm against + 5.0 V, and

• output are open collector type, inputs/outputs (wired- or technique).

Special Interfaces

Some modules have module specific interfaces/connectors. They are described

in the module documentation.

NOTE

All common TTL circuits operate with a 5 V power supply. A TTL signal is defined as "low"

or L when between 0 V and 0.8 V and "high" or H when between 2.0 V and 5.0 V (with

respect to the ground terminal).

Tab le 11 Remote Signal Distribution

Pin Signal Description

1 DGND Digital ground

2 PREPARE (L) Request to prepare for analysis (for example, calibration, detector

lamp on). Receiver is any module performing pre-analysis activities.

3 START (L) Request to start run / timetable. Receiver is any module

performing run-time controlled activities.

4 SHUT DOWN (L) System has serious problem (for example, leak: stops pump).

Receiver is any module capable to reduce safety risk.

5Not used

6 POWER ON (H) All modules connected to system are switched on. Receiver is any

module relying on operation of others.

7 READY (H) System is ready for next analysis. Receiver is any sequence

controller.

8 STOP (L) Request to reach system ready state as soon as possible (for

example, stop run, abort or finish and stop injection). Receiver is any

module performing run-time controlled activities.

9 START REQUEST (L) Request to start injection cycle (for example, by start key on any

module). Receiver is the autosampler.