GE IS200SCNVG1A SCR diode bridge control board

Description

GE General Electric Technical Specifications: IS200SCNVG1A

The RSCU (remote serial control unit) is an asynchronous

serial-to-parallel conversion unit that is IS200SCNVG1A used for remote

digital control over an RS-422 serial data link. Serial data is

received and transmitted by using a half-duplex RS-422

(balanced differential) at 9600 Baud. The transmitter/

receiver is capable of communicating up to 4000 feet from

the host in noisy industrial IS200SCNVG1A environments. A system can use

up to 40 RSCUs on one RS-422 link. See Figure 2 for an

illustration of an RSCU system configuration.

The RSCU is packaged in a black ABS plastic container for

mounting purposes. The container also protects the board

in industrial environments. Four mounting holes are

provided in the back of the container. The mounting holes

are easily accessed by removing four screws and the cover.

The IS200SCNVG1A unit’s 24 parallel bits provide interface for up to 241/0

devices such as optically isolated solid-state relays. Parallel

devices, such as analog converters, may also be controlled.

The RSCU has five main elements: MK3873 microproces

sor, address select logic, reset logic, serial line transmitter/

receiver, and parallel I/O with data-direction jumpers (as

illustrated in Figure 3).

The MK3873 single-chip microprocessor has a serial I/O

port that provides data for the RS-422 driver and receiver

which communicates with the IS200SCNVG1A host system. The MK3873

also provides 29 bits of parallel I/O (Three bits used

internally on the board and two that are unused.), of which

24 are available for off-board use.

ADDRESS SELECT LOGIC

The address select logic consists of an 8-bit parallel-in,

serial-output shift register. The shift register inputs are

jumper-selectable to the desired unit address for the RSCU.

Power-up reset or push-button reset causes the micro

processor to load and read the shift register by serially

shifting in the 8-address bits.

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