EX213, 221, 230 & 233
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1
4.5 Connections
Connections from the PC to the EX230 come via your chosen Digital IO/Counter Timer board, out via
a 78 way cable (Order Code 9096 6349) to the EX233 Distribution Panel (Order Code 9096 6333).
The EX233 splits the 72 lines of Digital IO/Counter Timer signals into 3 groups, Groups X, Y and Z.
Each group contains either three 8-bit digital IO ports or six CLK/GATE counter timer inputs and
outputs. Each group has its own 37-way D connector (male) and a row of 26 WAGO connectors, each
for an individual line. Connection to the EX230 should be made using a 37 way cable (Order Code
9101 4890) from the EX233 to SK3 on the EX230.
We recommend that opto-isolated inputs are used for all inputs to the computer. This provides a
greater tolerance to noise
Each input has its own I/P and 0V connection, The I/P (SK7) is connected to the positive side of the
opto isolator with 0V (SK8) connected to the negative. Both of these inputs are clearly marked on the
silk-screen.
For convenience, Jumpers J55- J75 connect the 0V inputs together in each group, so A0 0V is
connected to A1 0V using J55.
Figure 4
Channel A0 - input to the card
There is also a ‘shared bus’ feature, which allows the user to make either a signal or a power
connection to SK3 on the EX233 and it will be brought out on SK4 of the EX230. Both of the EX230s
sister boards the EX213 and EX221 also have this feature, see Section 7.32 for further details.
470R
470R
+5V
AGND
I/P
0v
HI/LOW
#
To EX233 and
Amplicon dio card
J55
To 0v on next channel
1K5
10K
Volt Free
Opto isolated
J31
4
