Teledyne Marine Instruments 2002 User Manual download pdf (Page 16)

149-072011 Model 2002 Vacuum Gauge Page 16 of 38

4.3. TTL Outputs

TTL outputs are provided for process control. High and Low set points are entered on the front panel (see

Section 3.4) and TTL signals are generated on the I/O cable in the following manner:

1. When the pressure as indicated by the Model 2002 is above the High set point, the High signal line (pin #3) will

be set to a TTL high level (+5 VDC). When the indicated pressure is below the High set point, the High signal

line (pin#3) will be set to a TTL low level (+0 VDC).

2. When the pressure as indicated by the Model 2002 is below the Low set point, the Low signal line (pin #4) will

be set to a TTL high level (+5 VDC). When the indicated pressure is above the Low set point, the Low signal

line (pin #4) will be set to a TTL low level (+0 VDC).

These TTL signals are used for a variety of applications. With these signals, the user has the capability to

turn off/on various equipment such as valves, flow controllers, pumps, heaters, and safety equipment.

4.4. Power Entry Module

The AC power for the Model 2002 enters the instrument through a power entry module that contains a fuse,

on/off switch and an IEC 320 power inlet.

The fuse is rated for 250 V, 1/4 A. It can be accessed by unplugging the AC cord and prying the fuse

compartment open with the tab and slot in the power inlet chamber. There is a spare fuse in the

compartment within the fuse holder.

Model 2002

Rear Panel Detail

Fig 4.2

TRANSDUCER CONN.

(FEMALE)

STANDARD

I/O CONNECTOR

LOW SETPOINT OPTION BOARD HIGH SETPOINT

RELAY CONNECTOR (MALE) RELAY

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 37 38

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Teledyne Marine Instruments 2002 User Manual Page 16