Table 7 25-pin EIA Connector

 

 

 

I

Pin No.

Signal Name

 

1

Chassis Ground

 

2

TXD

 

3

RXD

 

4

RTS

 

5

CTS

 

7

Signal Ground

11Reverse Channel (REV)

20Data Term Rdy (DTR)

 

23

TTY-RXD Return

Current

 

25

TTY-RXD

Loop Input

4. Theory of Operation

The data received by the MX-85 is stored in the 4K Byte Memory. Printing is initiated by the following means:

1.Receipt of the Carriage Return (CR) or Line Feed (LF) Control codes.

2.An excess of 80 characters (1 line) in the print buffer.

3.A transmission gap in excess of two (2) seconds, provided there are printable

characters stored in the buffer.

The MX-85 will continue to receive data and store it in the buffer memory while printing.

There are some conditions which will interfere with the ability of the MX-85 to receive and/or print data. These are:

1.Paper Low

2.Paper Empty

3.4K Memory Full

4.1. Low paper

The low paper sensor is mounted on the paper holder. It is activated when approximately 7 meters (22’) of paper is remaining. This should be adequate to print any message being transmitted at the time of activation. When the sensor is activated, the following conditions will take place:

Status - DTR pin 20 Mark (-V)

Data Entry - Available until buffer full Indicators - “Paper Out” ON

“Ready” OFF

Buzzer - Sounds for 20 seconds Printing - Unaffected

NOTE:

Buzzer will stop upon depression of LF or FF button.

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