IS200SRLYH2A GENERAL ELECTRIC gas turbine card

Description

GE General Electric Technical Specifications: IS200SRLYH2A

The IS200SRLYH2A MDX-EPROM/UART is a STD BUS-compatible

microcomputer module. Designed as a universal EPROM

add-on module for the STD BUS, the MDX-EPROM/UART

provides the system designer with sockets to contain up to

10K Bytes of EPROM memory (five 2716s) as shown in the

Block Diagram, Figure 2. The EPROM memories can be

positioned to start on any 2K boundary within a 16K block of

memory via a strapping option. Included on-board the MDX

EPROM/UART is a fully buffered IS200SRLYH2A asynchronous 1/0 port

with a teletype reader step control. A full-duplex UART is

used to receive and transmit data at the serial port.

Operation and UART options are under software control.

Once the unit has been programmed, no further changes

are necessary unless there is a modification of the serial

data format.

All serial interface lines are brought out to a 26-pin

connector J3. The IS200SRLYH2A serial cable is constructed of the

following parts:

26-pin connector (Ansley No. 609-2600M)

26 wire flat cable (Ansley No. 171-26)

25-pin standard EIA-RS232 connector (Ansley No.

609-25P)

IS200SRLYH2A Table 4 shows the interconnection between the 26-pin

connector and the 25-pin RS-232 connector.

RS-232 Interface

Because the MDX-EPROM/UART was designed to

communicate with RS-232 terminals (as opposed to other

types of communication peripherals). the serial interface

looks like a receivi ng modem or computer port rather than a

transmitting terminal port (such as a silent 7(0). The effect

is to scramble three pairs of signals. For example:

1. Transmitted Data (RS-232) from Terminal (Pin 3) is an

out-direction signal at the terminal but is shown as an

in-direction signal at the serial port.

SERIAL PORT TO RS-232 CONNECTOR

Table 4

Receive Data (RS-232) at Terminal (Pin 5) is an in

direction signal at the terminal but is shown as an out

direction signal at the serial port.

1. Request To Send (Pin 7) is an out-direction at the

terminal but is shown as an in-direction signal at the

serial port.

Clear To Send (Pin 9) is an in-direction signal at the

terminal but is shown as an out-direction signal at the

serial port.

1. Data Terminal Ready (Pin 14) is an out-direction signal at

the terminal but is shown as an in-direction signal at the

serial port.

Data Set Ready (Pin 11) is an in-direction signal at the

terminal but it is shown as an out-direction signal at the

serial port.

To change the sense of this port. i.e .• to make it look like a

transmitting terminal (as might be required in some OEM

applications). the two signals in each pair above need to be

interchanged.

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