1-ON-1 Communication Voltage Levels - Metasys - LIT-12012443 - Software Application - MS-FIT100-0 Field Inspection Tool

MS-FIT100-0 Field Inspection Tool User Guide

Brand
Metasys
Product name
MS-FIT100-0 Field Inspection Tool
Document type
User Guide
Document number
LIT-12012443
Revision date
2019-09-11
Language
English

In the 1-ON-1 mode, the FIT is only connected to a single controller that is not connected to a network. The communication voltage readings in this mode should be in the range of 4–10 VDC differential voltage and 2 to 5 VDC for the +, – line voltages. The important thing to note is that the + and – line readings typically are equal or within approximately 0.2VDC of each other. The + line voltage will usually read equal to or slightly higher than the – line voltage. See Figure 21 for an example.

Figure 1. 1-ON-1 Communication Example 1

If the readings taken are below 4V differential or the + and – readings are not within 0.4VDC of each other, then the controller may be damaged. Damaged controllers typically have a larger voltage difference (greater than 0.4VDC) between + and - readings. See Figure 22 for an example.

Figure 2. 1-ON-1 Communication Example 2