ControlMaster CM10, CM15, CM30 and CM50
Universal process controllers and indicators,
1
/8,
1
/4 and
1
/2 DIN 5 MODBUS Communications
16 IM/CM/C–EN
5.4 Pull-up and Pull-down Resistors
To prevent false triggering of slaves when the master (host computer) is inactive, pull-up and pull-down resistors must be fitted
to the RS422/485 interface in the host computer.
Resistors are normally connected to the interface by hard-wired links or switches – refer to the manufacturer's instructions
5.5 Termination Resistor
For long transmission lines, a 120 termination resistor must be fitted to the last slave in the chain – see Fig. 5.2.
Fig. 5.2 Connecting Multiple Slaves
14
15
16
17
18
14
15
16
17
18
CM10, 15, 30 CM50 CM10, 15, 30 CM50
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20
21
22
23
19
20
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23
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