Atest Gaz Sigma SmArt, User Manual

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4.2.2 Example of the connection diagram with 420 output
Figure 6: Example of the connection diagram with 420 output
Value of R
obc
shown in table 7.
4.3 RS-485 + 420 output – only SmArtGas 3
4.3.1 Connection diagram RS-485 + 420
Figure 7: Connection diagram (RS-485
+ 420)
No. Name Terminal Description
1 Supply Power supply port. Parameters – see section 7
- Negative supply pole (internally circuited with a
negative pole of the port 420)
+ Positive supply pole.
GND
Don't connect.
2 SBUS System communication port. Used for data
exchange between devices in Sigma Gas
system
RS+ Signal line A
RS- Signal line B
3 420 Output port of 420 signal
S Active current output
- Negative supply pole (internally circuited with a
negative pole of the port 420)
Table 5: Connection diagram description (RS-485 + 420)
p. 16|34
User's Manual: POD-009-ENG R07
+
S
-
- S +
SmArtGas 3
R
obc
Control Unit
U
ZAS
1 2
3
S
-
- + GND RS+ RS-