TRICONEX MA2211-100 CIM Media Adapter

The TRICONEX MA2211-100 (also labeled MA 2211-100) is a media adapter designed for use with Trident system Communication Interface Modules (CIMs). It converts the RS-232 serial port of the CIM (or other Triconex equipment) to an RS-422/RS-485 interface, allowing long-distance communication (up to 1200 meters) and multidrop networks. The adapter is optically isolated and self-powered from the RS-232 signal lines (no external power supply required for most applications).

Functional Description

The MA2211-100 acts as a bi-directional converter between RS-232 (DB9 female connector) and RS-485 (two-wire or four-wire) or RS-422 (four-wire). It is typically used to connect a Trident CIM (which has only RS-232 and Ethernet ports) to a plant-wide Modbus RTU network that uses RS-485. The adapter automatically detects data direction and enables the RS-485 driver without requiring hardware handshake lines (auto-transceiver control). It also provides electrical isolation between the RS-232 side and the RS-485 side, preventing ground loops and protecting the CIM from voltage spikes on the field wiring.

Technical Specifications

RS-232 interface: DB9 female, pins 2 (RxD), 3 (TxD), 5 (GND). Supports baud rates from 300 bps to 115200 bps. Data format: 7 or 8 data bits, 1 or 2 stop bits, parity none/even/odd. The adapter is powered by the RS-232 control lines (RTS, DTR) – it requires at least ±5 V on either line. If the connected device does not assert RTS or DTR, an external 5–12 VDC power supply can be connected to the adapter’s auxiliary power terminals.

RS-485/RS-422 side: Removable 5-pin terminal block (screw type). Signals: TX+ (A), TX- (B), RX+ (A’), RX- (B’), GND. For 2-wire RS-485, connect TX+ to RX+ and TX- to RX- externally. Terminating resistors (120 Ω) can be enabled via DIP switches. The adapter supports up to 32 nodes on a single RS-485 segment. Isolation voltage: 2500 VAC between RS-232 and RS-485 sides. Surge protection: ±15 kV ESD (air discharge).

Configuration Settings

Four DIP switches on the side of the adapter configure operation:

• SW1: Termination resistor enable (ON = 120 Ω across RS-485 lines).

• SW2: Bias resistors enable (ON = 680 Ω pull-up/pull-down on RS-485 lines).

• SW3: 2-wire (ON) or 4-wire (OFF) mode.

• SW4: Echo enable (for 2-wire, ON allows monitoring transmitted data).

For most Modbus RTU networks using 2-wire RS-485, set SW1 = ON (only on the two end nodes), SW2 = ON (only on one node), SW3 = ON, SW4 = OFF. The adapter has no user-programmable memory; all settings are switch-selectable.

Physical and Environmental

The MA2211-100 is housed in a DIN-rail mountable plastic enclosure (polycarbonate, UL 94 V-0). Dimensions: 90 mm width × 58 mm height × 25 mm depth. Weight: 100 g. Mounting: snaps onto 35 mm DIN rail. Operating temperature: -20°C to +70°C. Storage: -40°C to +85°C. Humidity: 0–95% non-condensing. The adapter carries CE, FCC, and RoHS marks. It is not safety certified (SIL) because it is a passive accessory; however, it may be used in safety-related systems when installed according to guidelines (e.g., power supply from a SIL-rated source).

Typical Applications

Connecting a Trident CIM (7400213-100) to a Modbus RTU network that uses RS-485. The CIM’s RS-232 port (limited to 15 meters) can be extended to 1200 meters using the MA2211-100 and RS-485 cable. Another common use is connecting a Tricon processor’s RS-232 diagnostic port to a remote TriStation workstation in a control room. The adapter can also serve as a general-purpose RS-232 to RS-485 converter for any industrial device that requires long-distance serial communication.

Installation and Wiring

Mount the adapter on a DIN rail near the CIM (within 1.5 meters). Connect a standard DB9 male-to-female serial cable (straight-through) between the CIM’s RS-232 port and the MA2211-100’s DB9 connector. Connect the RS-485 terminals to the twisted-pair cable (shielded recommended). Ensure the cable shield is grounded at only one end. For 2-wire systems, jumper TX+ to RX+ and TX- to RX- externally. Set the DIP switches as required. No external power supply is needed if the CIM provides RTS or DTR signals; otherwise, apply 5–12 VDC to the auxiliary terminals (+ and -). The green POWER LED illuminates when sufficient power is available; the yellow DATA LED flashes during transmission.

Troubleshooting

If no communication occurs, verify that the CIM’s RS-232 port is configured for the same baud rate and parity as the Modbus network. Check that the adapter’s termination and bias switches match the network rules (only end devices have termination). Use a voltmeter to confirm that the RS-485 lines have a bias voltage of 0.2–0.5 V between A and B (idle state). If the DATA LED remains off, check that the CIM is actually transmitting; many CIMs require a specific initialization command to enable the serial port. The adapter is transparent and does not modify data; thus, any protocol (Modbus, DNP3, etc.) is supported.

Maintenance and Spare Parts

The MA2211-100 has no user-serviceable parts; if damaged, replace the entire unit. Periodic cleaning of the enclosure is sufficient. The adapter is passive and does not require firmware updates. It is recommended to keep a spare adapter on hand for critical networks because a failure will interrupt communication. The adapter is also available under the same part number MA2211-100 from Triconex distributors.