Emerson E2 operation manual Device Termination, Maximum Number of Echelon Devices

RECOMMENDED

E2 E2

UNBROKEN		E226513125rev
CHAIN
Figure 8-1	- Echelon Wiring - Subnets
	E2s
		E226513131rev
Figure 8-2	- Echelon Wiring, pt. 2

8.3.1Maximum Number of Echelon Devices

A daisy-chained segment may contain no more than 63 total Echelon devices (also called "nodes"). If there are 64 or more Echelon devices at your site, an Echelon-compati- ble router (P/N 572-4200)will be required. A router placed on the Echelon Network allows you to add another 63-node daisy-chain network. For larger installations,

multiple routers can be used to extend the network indefi- nitely.

More information about routers and how they are used in a daisy-chain Echelon Network can be found in the Router and Repeater Installation Guide (P/N 026-1605).

8.4Device Termination

In a daisy-chain configuration, both ends of the net- work segment must be terminated. Terminate the E2 by setting jumper J2 to the UP position, as shown in Figure

8-3. Other devices on the Echelon Network are terminated either by jumpers on the control board or by connecting a 102-ohm “terminator block” at the end of the network seg- ment (see Section 8.4.1, Using a Termination Block (P/N 535-2715) to Terminate a Daisy Chain). Refer to the installation guide references at the end of this section for specific device termination instructions.

All other E2s and Echelon devices that aren’t at the end of a daisy-chained network segment must be untermi- nated.

If a router or repeater is being used in a network, termi- nation becomes more complicated, because routers and repeaters join multiple daisy-chain segments together. Refer to the Router and Repeater Installation Guide (P/N 026-1605), for specific termination instructions.

J2

E2J2

Termination

Figure 8-3- E2 Termination - Daisy Chain

8-2 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013