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S5-115U Manual
Connection
Connector pin assignments: Printer connecting cable for CPU 943/944 (ASCII driver)/PT 88
(see also Appendix C)
CPU 943/944 (2nd interface)
(15-pin Cannon subminiature
D connector)
TTY IN+
9
TTY IN -
2
TTY OUT+
6
TTY OUT -
7
M
1
EXT
Figure 12-9. Example of Connector Pin Assignments for Printer Cable
Note
Wrong wiring can destroy the interface processor.
12.4.1 Data Traffic
Figure 12-10 shows how the ASCII driver functions.
Peripheral
device
EWA 4NEB 811 6130-02b
SI 2 Interface
Input buffer
(1024 bytes)
Output buffer
(1024 bytes)
Figure 12-10. Example of Data Transport
Communications Capabilities
PT 88 printer (TTY)
(25-pin Cannon subminiature
D connector)
green
21
pink
18
white
10
brown
9
yellow
1
CPU RAM
Receive mailbox
Send mailbox
Send line
(BUSY, DC1,
DC3, ACK)
Receive line
Earth
12-21
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