6
INM MTL 130-0186 Rev 8
3.4 Electrical connections
3.4.1 Supply
Power connections should be made to the instrument using the IEC lead supplied.
3.4.2 RS232 Connection
NOTE:
See also section 8: Communication Protocol
DCE (instrument)
DTE (PC)
signal
description
9W
25W
9W
GND
Signal gnd
5
7
5
RX
Data received by instrument
2
2
3
TX
Data transmitted from instrument
3
3
2
3.4.3 Alarm and Analogue Output connections
See figure 2
CAUTION
The recommended cable used for external connection is double insulated.
WARNING
Although relay contacts are rated at 48V AC or DC, voltages above 33V AC
are defined as hazardous by BSEN61010-1 (Safety requirements for electrical
equipment for measurement, control and laboratory use). Appropriate
precautions should be taken when connecting signals to alarm terminals.
Figure 2
- Electrical and sample connections
