Epson MX-85 User Manual - Page 27

Theory of Operation, Low paper, Receipt of the Carriage Return CR or Line Feed LF Control codes.

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I Pin No. 1 2 3 4 5 7 11 20 23 25 Table 7 25-pin EIA Connector Signal Name Chassis Ground TXD RXD RTS CTS Signal Ground Reverse Channel (REV) Data Term Rdy (DTR) TTY-RXD Return TTY-RXD Current 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. -22-

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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
11
Reverse Channel (REV)
20
Data Term Rdy (DTR)
23
TTY-RXD Return
25
TTY-RXD
Current
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.
-22-