GE IS200SCNVG1ADC diode bridge control board

Description

GE General Electric Technical Specifications: IS200SCNVG1ADC

The IS200SCNVG1ADC RIOe (remote I/O controller) is an asynchronous serial

to-parallel conversion unit that is used for remote digital

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

received and transmitted by the RIOe in the half-duplex

mode at 9600 Baud. The transmitter/receiver (RS-422,

balanced differential) is IS200SCNVG1ADC capable of communicating up to

4CXJOfeet from the host in noisy industrial environments. A

system can use up to 40 RIOes on one RS-422 link. See

Figure 2 for an illustration of an RIOe system configuration.

The 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 RIOe has five main elements: MK3873 micro

processor, address select logic, reset logic, serial line

transmitter/receiver, and parallel I/O with data-direction

jumpers (as illustrated in Figure 3).

IS200SCNVG1ADC Table 1 is an example of data direction jumpering and the

corresponding output signal mnemonic, associated jumper

number, and 1/0 device (24-module

.’ . . opto 1/0 panel is used).

LINE TERMINATION RESISTOR

The RS-422 transmission line should be terminated

on

each end with a 200 ohm resistor. The p~rpose

or

thi~

resistor is to reduce IS200SCNVG1ADC reflections from the end of the cable.

Two printed circuit board holes are brovided for a,JAwatt

terminatinll resistor (R/9). Only an’RIOe placed on the

extreme end of the, transmission line requires termination.

LOW-VOLTAGE RESET ADJUSTMENT

Adjustment of R6 establishes the voltage ‘level at which the

MK3873 is reset on loss of power. This level is factory set at

4.6 voltS and should not ‘be changed. If R6has been

inadvertantly changed the following proced’tJre should be

used to reset the voltage level.

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