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Distech Controls IO-R-34 Manual
Wiring Details
Figure 5
IO-34 Power Wiring to 24vac/dc Power Source, shared with EC-BOS-8.
EC-BOS-8
24Vac/24Vdc
Power Source
RS-485 Communications
RS-485 communications from the EC-BOS-8 to each IO module (or assembly of modules) requires a continuous
"daisy-chain" wiring topology using a shielded, twisted-pair cable. Wire between the IO-R-16 assemblies using the
5-position end connectors. At the EC-BOS-8, wire to either of its 3-position RS-485 connectors.
Use shielded 18-22AWG wiring (refer to the TIA/EIA-485 standard). Wire in a continuous multidrop fashion, meaning
"plus to plus," "minus to minus", and "shield to shield." Connect the shield wire (reference ground) to earth ground
at one end only, such as at the EC-BOS. See
Bias Settings
EC-BOS-8
Each RS485 port on the
•
BIA - (Default, middle) RS485 biasing and termination: 2.7K Ohm bias resistors with no termination resistor
•
END - RS485 biasing and a termination: 562 Ohm bias resistors and 150 Ohm termination resistor
•
MID - RS485 biasing or termination: 47.5K bias resistors with no termination resistor
Often, adding RS-485 biasing can improve communications by eliminating indeterminate idle states.
•
BIA - (Default, middle) Often best if the RS485 trunk needs biasing, but when the EC-BOS is not installed at the end of the
trunk.
•
END - Often best if the EC-BOS is installed at the end of an RS485 trunk of devices that is not already biased.
•
MID - Often best if the EC-BOS is put in the middle of an already-biased RS485 trunk.
If desired, you can change the position of an RS485 port's bias switch while the controller is running.
Connect S terminal wiring as shown in
Caution
as reference ground between isolated RS-485 ports on EC-BOS-8 and IO-R-16 and IO-R-34 modules.
Remote IO-R-34 Module Mounting and Wiring Guide
IO-R-16
* Dedicated 24Vac Transformer neither side of secondary tied to earth ground
* 24Vdc Power Supply (Polarity not Critical) neither side tied to earth ground
Figure
6.
has an adjacent 3-position biasing switch, with these settings:
Figure 6
August 2, 2017
D5 5C6 D6
D7 7C8 D8
D9
IO-R-16
IO-R-34
0V
U1
0V
U2
U3
U4
U5
0V
U6
U7
0V
U8
or
or communication errors may result. S terminal serves
0V AO6
9C10 D10
AO1 0V AO2 AO3 0V AO4
AO5
AO7
0V AO8
U9
0V
U10
U11
0V
U12
U13
0V
U14
U15
0V
U16
AC
AC
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