7/8THERMAL MANAGEMENT SOLUTIONS EN-TraceTekTTNRM-IM-H5747401/13
D. Connect RS-485 cables and set address
1. Select the RS-485 address for the TT-NRM unit.
Each TT-NRM connected to a TTDM-128 must have a unique
addressintherange1to99.IftwoTT-NRMunitsareas-
signed the same address, communications faults will result.
To ensure you assign an unique address to each TT-NRM unit,
reviewthesystemlayout.Ifalayoutdocumentdoesnotexist,
create one. Assign an unique address to each TT-NRM unit.
Note: TraceTekTTSIMmodulesareconnectedonthesame
RS-485 network and must not have the same address as any
TT-NRM.
2. Set the RS-485 address for the TT-NRM unit.
Useasmallat-bladescrewdrivertorotatetheaddress
switchmarked“x1”tothedesiredaddress.Foranaddress
of50,setthe“x1”to0andthe“x10”to5.
Set address 0-9
Set 10's digit of address
L
N
+
–
ON
TxD
IO/RN
IO/ER
RxD
CRC
Address x 1
x 10
WAGO
750-315
I/0 SYSTEM
24V 0V
750-517 750-517 750-517
RS-485
3
2
1
Note: Previous wiring omitted for clarity
POWER SUPPLY
3. Connect RS-485 cables.
Note: Do not make connections to the RS-485 bus while it
is connected to an operating TTDM-128, or damage and/or
alarms could result.
The RS-485 bus allows units with unique addresses to be
daisy-chained together along a common bus. To add a new
unit to the network, simply daisy-chain the RS-485 bus from
the last unit to the new one—or insert the new unit between
twoexistingunitsonthebus.Theorderinwhichunitsare
attached to the RS-485 bus does not matter. There are just
two constraints on the RS-485 network:
• EachTT-NRMmustbeassignedauniqueaddress.
• TheRS-485busmustbeacontinuousstringfromthe
first unit to the last unit in the system.
Note: TheRS-485busoperatesat5V,andequipment
connectedtoitcouldbedamagedbyexposuretohigher
voltages.TakeprecautionstoavoidexposingtheRS-485
wiring to discharge of static electricity or other sources of
high voltage potential; in particular, avoid contact with the
power supply wiring.
1Connect the clear or white wire of the RS-485 cable to
the(+)terminalasshown.
2
ConnecttheblackwireoftheRS-485cabletothe(–)
terminal as shown.
3
Connect the shield wire of the RS-485 cable to the
shield terminal as shown.
IfconnectingtwoRS-485cables(oneINandoneOUT),use
the same terminals for both wires.
Important: Do not connect the shield of the RS-485 cable
to the enclosure or panel grounding terminal. Connect the
shield only to the terminal provided. To avoid the potential
for spurious ground loops, the RS-485 cable shield should
be connected to ground only in the TTDM-128.
