Emerson E2 operation manual Setting the Terminating and Biasing Jumpers, Powering the I/O Boards

1.The 8IO - this board automatically detects the baud rate being used by the I/O devices on the network, and adjusts to match their baud rate.

2.The 8DO - this board automatically detects the baud rate being used by the I/O devices on the network, and adjusts to match their baud rate.

3.The ARTC - this board is fixed at 9600 baud.

Baud Rate for MultiFlex Boards

On all MultiFlex boards, switches 6 and 7 on S3 are used to set the baud rate. To communicate at 9600 baud, set switch #6 to the UP position and #7 to DOWN. For 19200 baud, set switch #6 to the DOWN position and #7 to UP.

Baud Rate for the MultiFlex ESR

Set the baud rate on the MultiFlex ESR board by set- ting switches 6 and 7 on the network address terminal (labeled S1).

To communicate at 9600 baud, set switch #6 to the UP position, and switch #7 to DOWN. For 19200 baud, set switch #6 to the DOWN position and switch #7 to UP. (Currently, 9600 baud is recommended).

Recommended Baud Rate

The baud rate should be set to 9600 baud in all cases.

6.1.8Setting the Terminating and Biasing Jumpers

The I/O Network connector, for all I/O boards and the E2, has a set of three terminating jumpers. They are the jumpers positioned closest to the I/O Network connector. The E2 has jumpers next to each of the COM ports that can be configured as an I/O network (COM2, COM4, and COM6).

The purpose of the jumpers is to provide network ter- mination resistance and network biasing to the two ends, or termination points, of the daisy chain. One device at the beginning and one device on the end must be terminated

and biased by placing all three jumpers in the UP position. All other devices on the daisy chain must have all three jumpers set to the DOWN position. Figure 6-2shows the proper terminating jumper settings for the E2 and for all I/ O boards.

I/O BOARD AND E2 TERMINATING JUMPERS

THE TERMINATING JUMPERS MUST

BE IN THE UP POSITION IF AT THE

BEGINNING OR END OF THE NETWORK.

THE TERMINATING JUMPERS MUST

BE IN THE DOWN POSITION IF NOT AT

THE BEGINNING OR END OF THE NETWORK.

Figure 6-2- I/O Network Termination Jumper Settings

6.1.9Powering the I/O Boards

All models of E2-compatible I/O boards require 24VAC Class 2 input power. Some boards such as the 16AI, 8RO, 4AO, 8DO, MultiFlex ESR, and MultiFlex 16 use a center-tappedpower source. All other models, such as the 8IO and MultiFlex Combination I/O boards, may use non-center tapped power sources.

Retail Solutions supplies a wide variety of 24VAC transformers with varying sizes and either with or without center taps. Table 6-2shows the transformer sizes and whether they are center-tapped or non-center-tapped. Table 6-3lists each board, the board’s rating, and whether

or not the board must use center-tapped power.

Xformer P/N	VA Rating	Input Voltage	Center Tap?
640-0041	50 VA	110 VAC	No
640-0042	50 VA	220 VAC	No
640-0056	56 VA	Multi-tap (120/208/240 VAC)	Yes
640-0050	75 VA	110 VAC	No
640-0045	75 VA	220 VAC	No
640-0080	80 VA	Multi-tap (120/208/240 VAC)	Yes

Table 6-2- Transformers Compatible with I/O Network Boards

6-4 • E2 RX/BX/CX I&O Manual 026-1610 Rev 13 14-SEP-2011