Document #10-32813 Rev A; June 07, 2019
Page 6 of 69
Chapter 1 | About the RMA PLUS
The RMA PLUS is a remote access, high-speed communication gateway that provides access to all Watlow RM con-
trol modules in a system, using up to four busses via Ethernet, USB or serial.
RMA PLUS routes standard bus transactions over Ethernet and USB to all devices connected to the intermodule bus
network to allow for easy system configuration and monitoring. All units come standard with a built-in managed Ethernet
switch and two Ethernet jacks. RMA PLUS also connects to third-party and legacy devices, acting as a gateway
between Modbus® TCP and Modbus® RTU. Up to three Modbus® TCP sessions, three standard bus over Ethernet
sessions and one standard bus over USB session are available.
l Built-in Ethernet switch offers port mirroring for troubleshooting
l Built-in Ethernet switch protects from broadcast and multicast storms
l Integrated USB provides real-time communication to PC
l Modbus® TCP and Modbus® RTU allow you to build tables based on your unique needs and manage custom data sets
asynchronously to fieldbus activity
l Modbus® TCP and Modbus® RTU connect to third-party and legacy devices
Conceptual Overview
l On initialization, the RMA PLUS reads the file “nor:\Setup.csv” (from the included USBdrive) for feature configuration
and file paths.
l Gateway busses and enabled features (i.e. Modbus® TCP, Data Logging, etc) are instantiated.
l Delivery and transfer speeds for discovery are mere seconds.
l Gateway busses interact with target devices to read/write data points. RMA PLUS logs any data point in the system,
available as .csv files for easy access.Standard units are equipped to handle 16GB of data.
l Fieldbusses interact with gateway bus data sets, not directly with the target device.
Specifications
Feature Specification
EZ-ZONE Product Compatibility
l Any Watlow product with high-speed or low-speed bus capabilities, i.e.:
l EZ-ZONE RM (C, E, H, L, S) version 9.0+ intermodule bus
l EZ-ZONE PM, RUI, ST standard bus
l EZ-ZONE RM (F, G, UH, Z) intermodule bus
l POWERGLIDE intermodule bus
Supply Voltage
l 24V
Power
l 4W, 9VA
Ethernet Communication
l 10/100 Ethernet with managed switch
Standard Communication
l Ethernet
l USB
l Serial (‘C’ connector)
l Modbus® TCP over Ethernet
Additional Communication Options
l Isolated EIA 232/485, Modbus® RTU
USB
l USB 2.0 device
l Mini USB connector
l Composite device: vendor specific and mass storage classes
Real Time Clock with Battery
Backup
l Battery typical lifetime rating of 10 years