Hardware Handshaking (Ready/Busy) - Sun Microsystems SunSAI/P User Manual

Hardware Handshaking (Ready/Busy)

Most terminals and printers use Data Terminal Ready (DTR) for Ready/Busy
hardware handshaking. The cable shown below supports this method.
FIGURE 4-3
Note – Shielded cable must be used to remain in compliance with Part 15 of FCC
rules.
Note – Some Okidata printers use a control signal on pin 11, called Supervisory
Send Data (SSD) instead of DTR. In this case, simply connect CTS on the female DB-
25 side to pin 11 of the male DB-25, instead of pin 20. Other printer manufacturers
may use different methods of flow control. Consult your printer's documentation for
specific wiring requirements.
12 SunSAI/P User's Guide • November 1998
Host Adapter
(DB-25 Male)
Signal Pin
GND Shell
TxD 2
RxD 3
RTS 4
5
CTS
DSR 6
SG 7
8
DCD
DTR 20
RI 22
( Cable Shield)
Terminal/Printer Cable with DTR Handshaking
Peripheral
(DB-25 Male)
Pin Signal
1 GND
2 TxD
3 RxD
4 RTS
5 CTS
6 DSR
7 SG
8 DCD
20 DTR
22 RI