GE IS200SSCAH2AGD Communication I/O Terminal Board

Description

The GE General Electric IS200SSCAH2AGD, also cataloged as the IS200SSCAH2AGD Serial Communication I/O Terminal Board, operates as a dedicated hardware component for serial protocol interfacing within Mark VI Speedtronic Control System networks. This surface-mount board manages six independent, configurable communication channels supporting RS-232C, RS-422, or RS-485 signal modes, executing direct data serialization between field instruments and the host PSCA I/O pack via a dedicated DC-37 pin connection interface.

Hardware Specifications

Triple Modular Redundancy (TMR) 2oo3 Architecture and Fail-Safe State Execution

Operating within the Mark VI architecture, the IS200SSCAH2AGD ensures deterministic communication routing and fail-safe state execution through integrated hardware-level component validation and loop isolation. The onboard read-only memory chip (U1) acts as a hardware compatibility firewall, storing the explicit board type, revision number, and serial ID which are continuously interrogated by the PSCA processor to trigger instant communication shutdown faults upon data mismatch detection. Each of the six channels possesses isolated trace spacing to suppress signal cross-talk, while jumpers JP1R through JP6R allow field engineers to select either a resistive or capacitive return path to SCOM, optimizing noise attenuation without risking data loop integrity.

Frequently Asked Questions

Q: How is the line termination handled on this board for long-distance RS-485 or RS-422 multi-drop networks?

A: The board features physical, onboard jumper blocks for each of the six channels. Jumpers JP1A through JP6A apply or isolate the termination resistors across signal lines A and B, while JP1B through JP6B handle lines C and D. By default, these jumpers are set to the disconnected state.

Q: What is the orientation and terminal assignment pattern for the serial ports on the 48-position block?

A: Every channel is allocated a six-point contiguous terminal group sequenced from left to right as SCOM, A, B, C, D, and Ret. Looking at the terminal matrix, the bottom layer houses channels 5, 4, and 1 from left to right, while the top layer contains channels 6, 3, and 2 from left to right.

Field Installation Guidelines

• Mounting Assembly Configuration: Mount the assembly vertically using the sheet metal carrier and plastic insulator on a grounded metallic DIN-rail, or bolt the structural frame directly into the enclosure chassis layout.
• Shield Ground Termination: Terminate all external #18 AWG shielded twisted pair cable shields directly into the SCOM terminals (positions 37 through 48) to establish an effective electrical noise barrier.
• Chassis Ground Connection: Secure low-impedance grounding conductors into the conductive-rimmed E1 and E2 mounting holes to ensure complete frame ground continuity.
• Hot-Plug Constraint Verification: Power down the associated loop or isolate the DC-37 logic connector prior to adjusting termination resistors or changing return loop jumpers to avoid transient voltage induction.