Emerson E2 User Manual download pdf (Page 64)

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

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.

6.1.8 Setting 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 6-2 shows the

proper terminating jumper settings for the E2 and for all I/

O boards.

6.1.9 Powering 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-tapped power 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 6-2 shows the transformer sizes and

whether they are center-tapped or non-center-tapped.

Table 6-3 lists each board, the board’s rating, and whether

or not the board must use center-tapped power.

Figure 6-2

- I/O Network Termination Jumper Settings

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.

I/O BOARD AND E2 TERMINATING JUMPERS

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

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 272 273

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Emerson E2 User Manual Page 64

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