IBM 5100 Maintenance Information Manual page 20

The following diagram shows the lines that are used during
serial I/O operations and the way they are connected to the
5100 in terminal mode. Refer to the
IBM 5100 Mainten-
ance Information Manual for the serial I/O connector and
Zl cable socket pin numbers.
Base I/O
Card (F2)
Bus Out
Expansion
Feature Card (B2)
'+510 data term rdy'
Z1 Cable
Socket
\
Serial I/O
Connector
I
r----,--,
.-----.
Serial I/O Device
Data Terminal Ready
'+510 data set rdy'
i - - -..... t""'1
Data 5et Ready
Busln
'+510 request to send'
I - - -.....
~i
Request To 5end
14----11111j
'+510 clear to send'
Clear To 5end
Device Adr Bus
'+510 xmit data' Transmitted Data
Control
'+510 rcvd data'
Received Data
'+510 rcvd line sig det'
+ext horiz dr
5ignal ground
5ignal Ground
Protective ground
1----4._-+-----+-._-:-------:--1
Protective Ground
The function of each line and the sequence in which they
are turned on and sensed in terminal mode is as follows:
• After the serial I/O program is loaded and enabled, the
5100 turns on '+510 data term rdy' to indicate that it
is ready for serial I/O operations.
• The serial I/O device turns on data set ready, which is
sensed at '+510 data set ready' at the expansion feature
card.
Note: The sequence in which data terminal ready and data
set ready are activated is not significant.
When the 5100 is going to transmit data to the serial I/O
device:
1. The 5100 turns on '+510 request to send' to indicate
that it is ready to send data.
2-14
2.
3.
L _____
...1
I
Internal
Cable
L ____ _
,
Serial I/O
Terminal Cable
The serial I/O device turns on clear to send ('+510
clear to send' at the expansion feature card) to
indicate that the device is ready to receive data from
the 5100.
The 5100 sends the data on the '+510 xmit data'
line to the serial I/O device .
When the 5100 is going to receive data from the serial I/O
device:
1.
2.
The lines data terminal ready and data set ready are
activated the same as when the 5100 is transmitting
data to the I/O device.
The line request to send ('+510 request to send' at
the card) remains off. Thus, the line '+510 clear to
send' will also be off.
3. The data is received from the serial I/O device on the
'+510 rcvd data' line.
/