Handshaking
80-60100000-02
14–3
14.3.2 Handshaking enabled
With handshaking enabled, a ‘straight through’ cable is required:
P S V
( 2 5 P i n M a l e
o n l e a d )
P C N C
( 2 5 P i n F e m a l e
o n l e a d )
7
8
20
2
3
4
5
6
1
P C N C
( 9 P i n F e m a l e
o n l e a d )
2
3
4
5
6
7
8
1
Shield
7
8
20
2
3
4
5
6
1
F G
T X D
R X D
R T S
C T S
D S R
S G
D C D
D T R
Name
Direction
Figure 14.2 - Control Link handshaking cable specification
Cabletron supplies cables meeting these requirements:
Description
Part Number
25-way male to 25-way female
SPEC0118
25-way male to 9-way female
SPEC0121
14.4 Symptoms of incorrect cabling
14.4.1 Handshaking disabled
With handshaking disabled, a ‘looped’ cable is required. If a ‘straight
through’ cable is used, it will not be possible to select devices correctly.
When you attempt to poll a device, its command-line prompt will not
appear. When you attempt to poll a different device, PCNC will display
any prompts or messages generated by the first device during the time it
was polled. The command-line interface will be erratic, and you will be
unlikely to be able to use it.
14.4.2 Handshaking enabled
With handshaking enabled, a ‘straight through’ cable is required. If a
‘looped’ cable is used, it will be possible to communicate with devices
correctly, but PCNC will be unable to control the flow of alert information.
