1. Launch the DXM Configuration Software tool.
2. Click on the
Register View
tab on the left part of the page.
3. In the upper right part of the window select
Modbus Registers using Modbus Slave ID
radio button and enter
Modbus Slave ID 200.
4. To set universal input 8 as the sense, write Modbus register 3446 with 5 (Potentiometer Sense).
5. Verify the jumpers are still set to their default position. One jumper should be on pins 1 and 3 to get a 2.7 V source
voltage out pin 45. The default position of the other jumper is on pins 4 and 6.
6. Connect one potentiometer side to power output (pin 45), connect the tap point of the pot to universal input 8 (pin 37),
and connect the other end of the pot to ground (pin 36).
5.12.2 Isolated Discrete Inputs
The DXM has two (2) optically isolated inputs. The inputs signals are electrically isolated forming a barrier to protect the DXM
from different ground potentials of the input signals.
Input 1 uses terminals 1A and 1B and the second input uses 2A and 2B. An input voltage should be applied between the
terminals between 0 and 30 V DC, the on/off transition threshold is approximately 2.6 V.
Table 18: Isolated discrete input pins
Pin
Modbus
Register
Input
Description
Pin 14
501
Input 1A
Optically isolated AC input type, 0 to 12 to 30 V DC
Input to output isolation of 2.5 kV
IN xA
IN xB
Pin 15
Input 1B
Pin 16
503
Input 2A
Pin 17
Input 2B
Synchronous Counters
—An isolated input can be programmed to count the input signal transitions. When an input is
enabled as a counter, the counter value is stored into two 16-bit Modbus registers for a total count of 32-bits (unsigned). To
program an input to capture the edge transition counts, follow
Example: Configure Input 1 as a Synchronous Counter
page 33.
The counters are synchronous because the inputs are sampled at a 10 ms clock rate. The input logic does not detect rising
or falling edges, it samples the input every 10 ms to find level changes. The input signals must be high or low for more than
10 ms or the input will not detect transitions. Because most signals are not perfect, a realistic limit for the synchronous
counter would be 30 to 40 Hz.
Universal inputs can also be configured as a synchronous counter. See
on page 66 for all the
register definitions. The procedure for creating a synchronous counter is the same as a isolated input with the addition of
changing the input type to PNP or NPN.
5.12.3 Relay Outputs for the DXM150-B1, 1500-B1, and 150-S1
Table 19: Relay output pins
Pin
Output
Description
Wiring
Pin 19
Output 1: Normally Open
SPDT (Form C) relay, 250 V AC, 16 A
Normally open
Common
Normally closed
Pin 20
Output 1: Common
Pin 21
Output 1: Normally Closed
Pin 22
Output 3: Normally Open
Pin 23
Output 3: Common
Pin 24
Output 3: Normally Closed
Sure Cross
®
DXM150 and 1500-Bx Wireless Controllers
34
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