PC3000 Complete Installation guide iss 12 - Elektro-Trading
PC3000 Complete Installation guide iss 12 - Elektro-Trading
PC3000 Complete Installation guide iss 12 - Elektro-Trading
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Local Controller Plus Module<br />
6-<strong>12</strong><br />
Notes:<br />
1. <strong>PC3000</strong> cables supplied by Eurotherm do not swap the receive and<br />
transmit pairs. Where these cables are used to connect from one<br />
<strong>PC3000</strong> to another it will be necessary to introduce a swap on one end<br />
of point to point connections or the master connection of Master-Slave<br />
connections. This can be done either by using links LKA5-8 (port A<br />
only) or external to the LCM-Plus on terminal block assemblies. For<br />
further details of cabling options please refer to the section on cabling<br />
in the <strong>PC3000</strong> installation handbook.<br />
2. Termination resistor(s) should be fitted to both ends of the cable used<br />
for RS485 connections. All other connections to the cable should not<br />
be terminated. Correct termination is particularly important when<br />
cable lengths are long. A ‘4-wire’ cable can be terminated by<br />
connecting a <strong>12</strong>0Ω resistor between the Rx+ and Rx- for each end. A<br />
‘2-wire’ cable can be terminated by connecting a single <strong>12</strong>0Ω resistor<br />
between Rx/Tx+ and Rx/Tx-. A single link selectable termination<br />
resistor is provided on the LCM-Plus between Rx+ and Rx- (Rx/Tx+<br />
& Rx/Tx- when Tx and Rx are shorted by LK*3 & 4). This link can<br />
be used to provide the required termination in some configurations but<br />
other configurations will require external termination resistors.<br />
<strong>PC3000</strong> - <strong>Installation</strong> Guide
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