GE PACSystems RX3i Serial Communications Modules IC695CMM004 In stock

The IC695CMM004 is a serial communications expansion module engineered for the Emerson (GE) PACSystems RX3i programmable automation controller platform. Installed directly into an RX3i Universal Backplane slot, the IC695CMM004 supplies four independent, fully isolated RJ-45 serial ports, each software-configurable for RS-232 or RS-485/422 operation. The IC695CMM004 supports MODBUS (Master/Slave), DNP3 (Master/Slave), CCM Slave, Serial I/O, and SPL custom protocols, with selectable baud rates from 1200 to 115.2K. The IC695CMM004 integrates seamlessly with the CPU via high-speed backplane communication, enabling deterministic serial data exchange for SCADA, HMI, and field device connectivity without consuming additional controller processing overhead.

Serial device integration with RX3i PLC systems (bar code readers, weigh scales, RFID tags, GPS receivers)

MODBUS RTU networking for SCADA / HMI data acquisition

DNP3 master/slave communication for utility substation automation

Connecting variable frequency drives (VFDs), flow meters, pressure transmitters, and power quality meters

Gateway and protocol conversion between serial fieldbus devices and RX3i CPU backplane

Remote I/O expansion racks managed by PROFINET Scanner (up to 4 modules per remote rack)

Low-temperature outdoor substation applications (IC695CMM004LT variant)

Hazardous location installations requiring ATEX / Class I Div 2 certification

Four Fully Independent Isolated Ports: Each of the four RJ-45 ports operates independently with dedicated UART and protocol configuration — no shared resources or arbitration conflicts.

Software-Selectable Electrical Interface (RS-232 / RS-485/422): Per-port selection of RS-232 (point-to-point, up to 15m) or RS-485/422 (multidrop, up to 1200m) eliminates dip switches and rewiring when changing field devices.

Multi-Protocol Support: Per-port configuration for MODBUS Master, MODBUS Slave, DNP3 Master, DNP3 Slave, CCM Slave, Serial I/O, or SPL custom protocol. DNP3 mode locks all four ports to DNP3 master/slave variants for consistent application operation.

Hardware Flow Control: RTS/CTS and RFR/CTS handshake support for RS-232, preventing data overrun when communicating with legacy serial peripherals.

Hot-Swappable Installation: Module can be inserted or removed while the RX3i system remains powered — no rack shutdown required for maintenance or upgrades.

Galvanic Isolation (Port-to-Port & Port-to-Backplane): 500 VDC continuous between ports, 250 VAC continuous port-to-backplane. Blocks ground loops, noise coupling, and fault propagation across communication channels and backplane.

Built-In Fault Status Reporting: Module continuously self-checks — watchdog expiration, RAM failure, flash checksum error, and CPU heartbeat failure are all detected and reported to the CPU.

On-Board LED Diagnostics: Module OK (power/health), Port Fault (any port error), and four Port Status LEDs (activity per channel) enable rapid troubleshooting without external diagnostic equipment.

Flash Memory for Field Firmware Upgrades: Future firmware revisions can be loaded in the field using WinLoader or web-based tools — no module removal or factory rework required.

Dual Conformal Coating Options (CA variants): IC695CMM004CA conformal-coated version for high-humidity and corrosive gas environments (chemical plants, offshore platforms, wastewater facilities).

Low-Temperature Variant (IC695CMM004LT): Rated for -40°C to +60°C operation — suitable for outdoor enclosures and unheated substations in extreme winter climates.

Remote Rack Support: Up to 4 modules per remote rack managed by RX3i PROFINET Scanner, up to 1 module per remote node on CEP Carrier — expands serial I/O to distributed physical locations.

ATEX / Class I Div 2 Certified: Certified for installation in potentially explosive atmospheres (gas zones, refineries, fuel handling areas) when installed in appropriate enclosures.

Expands the RX3i CPU's native serial communication capacity by providing four additional isolated ports, offloading serial polling and message processing from the controller‘s main logic execution.

Bridges serial field devices (MODBUS RTU instruments, DNP3 remote terminal units, legacy serial peripherals) to the PACSystems backplane, where data is mapped directly into CPU memory for ladder logic, function block, or structured text access.

Executes MODBUS master/slave exchanges according to pre-configured data mappings — master mode sends function codes (01, 02, 03, 04, 05, 06, 15, 16) and collects responses; slave mode responds to requests from external masters.

Performs DNP3 master/slave communications for utility substation automation, including unsolicited reporting, time synchronization, and cold restart commands to outstations (function code 13).

Implements Serial Protocol Language (SPL) for custom user-defined serial protocols — users can script proprietary handshakes, checksums (BCC, CRC16), and message parsing for non-standard equipment.

Routes fault information (watchdog expiration, RAM errors, flash failure, port communication errors) from the module to the CPU‘s diagnostic tables, where they can be viewed through Machine Edition programming software.

Reports module identity, firmware revision, port configuration, and status via pre-defined status data structures accessible from the user application.

Transfers data between the backplane and serial ports at deterministic scan rates, with selectable baud rates up to 115.2K, ensuring timely delivery of control commands and data acquisition polls.

Provides port-to-port and port-to-backplane electrical isolation, breaking ground loops and protecting the CPU from voltage surges originating on field communication cables.

When installed in remote PROFINET Scanner racks or CEP Carrier remote nodes, extends serial communication capability to physically separated I/O locations over the industrial Ethernet backbone.

Q1: What is the IC695CMM004 used for?
A1: The IC695CMM004 is a four-port serial communications module that expands Emerson (GE) PACSystems RX3i PLC serial connectivity for MODBUS, DNP3, CCM, and Serial I/O device integration.

Q2: What serial electrical interfaces does the IC695CMM004 support?
A2: The IC695CMM004 supports RS-232, RS-422, and RS-485 interfaces, each software-selectable per port. RS-232 is for point-to-point links up to 15m, while RS-485 handles multidrop networks up to 1200m.

Q3: Is the IC695CMM004 hot-swappable?
A3: Yes, the IC695CMM004 supports hot insertion and removal. It can be replaced while the RX3i system remains powered, following the procedures in the PACSystems RX3i System Manual.

Q4: What is the port-to-backplane isolation rating of the IC695CMM004 ?
A4: Port-to-backplane isolation is rated at 250 VAC continuous, 1500 VAC for one minute, and 2550 VDC for one second. Port-to-port isolation is 500 VDC continuous and 710 VDC for one minute.

Q5: How many IC695CMM004 modules can be installed in a single RX3i system?
A5: Up to six IC695CMM004 modules can be installed in the main RX3i CPU backplane. Up to four modules are allowed in remote racks managed by a PROFINET Scanner, and up to one module in a CEP Carrier remote node.

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