M800 Gas Flow Computer - Spirax Sarco
M800 Gas Flow Computer - Spirax Sarco
M800 Gas Flow Computer - Spirax Sarco
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Master<br />
1200 m (4000 ft)<br />
-Tx<br />
Tx T Rt<br />
Enable<br />
+Tx<br />
-Rx<br />
Rx R Rt<br />
+Rx<br />
100 100 <br />
½ W ½ W<br />
GWG<br />
SLAVE -Tx<br />
Tx T<br />
+Tx<br />
1<br />
Enable<br />
-Rx<br />
2<br />
Rx R<br />
+Rx<br />
3<br />
100 100 <br />
½ W ½ W<br />
4<br />
GWG<br />
Key:<br />
T - Transmitter<br />
R - Receiver<br />
- Circuit ground or circuit common<br />
- Protective ground or frame ground<br />
GWG - Green wire ground or power system ground<br />
Rt - Termination resistor<br />
Fig. 27 Typical RS485 four-wire multi-drop network<br />
+ Tx<br />
- Tx<br />
- Rx<br />
+ Rx<br />
-Rx<br />
Rt<br />
+Rx<br />
-Tx<br />
Rt<br />
+Tx<br />
T<br />
R<br />
Slave<br />
100 100 <br />
½ W<br />
½ W<br />
Rx<br />
Enable<br />
Tx<br />
GWG<br />
<strong>M800</strong> RS485<br />
option board<br />
5.9 Relay (dual) option board<br />
TBK2<br />
Low alarm<br />
L N<br />
Alarm<br />
Fuse<br />
3 mA (max)<br />
1<br />
2<br />
3<br />
com<br />
no<br />
nc<br />
TBK1<br />
Low alarm<br />
L N<br />
Alarm<br />
Fig. 28 Wiring diagram - Relay option board<br />
Fuse<br />
3 mA (max)<br />
1<br />
2<br />
3<br />
com<br />
no<br />
nc<br />
Relay option board<br />
IM-P333-25 MI Issue 2 27
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