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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