Emerson MRLDS Operation Manual page 15

controller's user manual.
Figure 4-9
- Connecting the Gateway to the E2 RS485 Network
To connect the Gateway to an MRLDS, feed the wires
through the rectangular opening in the sensor base as indi-
cated in Figure 1-1. Locate the RS485 connector and
secure the wire leads to the connector orienting them as
shown in Figure 4-10. Connect multiple MRLDS units in
a daisy-chain configuration as shown in Figure 4-1.
MRLDS - INSIDE LOWER
PORTION OF BASE
Shield
MODBUS
drain/ground
NETWORK
wire
Figure 4-10
- Connecting the Gateway to MODBUS
4.3.7 Termination Settings
As part of a site controller's RS485 I/O (COM A or
COM D) Network, a Gateway must be terminated if it is
the end device of a daisy chain. The Gateway on the Mod-
bus Network should always be terminated and always
located at the end of the daisy chain.
Refer to the site controller's user manual for informa-
tion about daisy chain networks and how they are termi-
nated.
To terminate the Gateway (the Modbus jumpers should
always be terminated on the Gateway), set the receiver bus
jumpers to the RIGHT position (Figure 4-11).
MRLDS Gateway
GATEWAY BOARD
-485
0v
+485
To MRLDS
GATEWAY BOARD
MODBUS
-485
0v
Shield drain/
+485
ground
wire
-485
0v
+485
RS485 I/O NET
TERM JUMPERS
TERMINATION
(ALWAYS
TERMINATE)
Figure 4-11
-MRLDS Gateway Termination
4.3.8 Gateway Board I/O Net
Addressing
Set the address on the I/O Network with switches 1-4.
There can be more than one MRLDS Gateway with each
supporting up to 12 MRLDS units.
Switch 5 indicates whether the MRLDS will be
mapped as an IRLDS or 16AI. Set switch 5 to the OFF
position for IRLDS emulation or to the ON position for
16AI emulation.
ADDRESS ON
I/O NET
14
Figure 4-12
- Network Layout Example
MRLDS Modbus Version (809-101x)
RS485
I/O NET
(TO CPC
CONTROLLER)
I/O NET MODE
ON = 16AI
OFF = IRLDS
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