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Agilent InfinityLab LC Series Diode Array Detectors User Manual 195

12 Hardware Information

Interfaces

To provide maximum safety within a distributed analysis system, one line is

dedicated to SHUT DOWN the system’s critical parts in case any module detects

a serious problem. To detect whether all participating modules are switched on

or properly powered, one line is defined to summarize the POWER ON state of all

connected modules. Control of analysis is maintained by signal readiness READY

for next analysis, followed by START of run and optional STOP of run triggered on

the respective lines. In addition PREPARE and START REQUEST may be issued.

The signal levels are defined as:

• 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).

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).

Table 29 ERI signal distribution

Pin Signal Description

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

module). Receiver is the autosampler.

2 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.

3 READY (H) System is ready for next analysis. Receiver is any sequence con-

troller.

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

any module relying on operation of others.

5 Not used

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

Receiver is any module capable to reduce safety risk.

7 START (L) Request to start run / timetable. Receiver is any module perform-

ing run-time controlled activities.

8 PREPARE (L) Request to prepare for analysis (for example, calibration, detec-

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

ties.

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