Black Box 3600 User Manual page 33

Table 2-1. Pin Signal Descriptions (Continued)
EIA- CCITT
Pin 232D V.24
7 AB
8 CF
9 --
10 --
11 --
15 DB
17 DD
18 --
* Modem options may force these signals on or cause them to be ignored.
*
** Refer to Appendix C, Hardware Options.
*
† This function can be disabled or its logic sense reversed by hardware straps.
*
Signal
102 Signal
Ground
109 Receive
d Line
Signal
Detector
+12
Volts
-12 Volts -12 voltage reference
Signal
Quality
Indicator
114 Trans-
mit
Clock
(DCE)
115 Receive
Clock
141 Local
Loop-
back
Modem 3600
Description
Signal or common signal and dc
power ground. **
A positive level from the modem
indicating the presence of a
received signal (carrier detect). *
+12 voltage reference
This circuit indicates probability
of errors in the received data: a
positive level indicates poor signal
quality while a negative level
indicates good signal quality. †
A transmit data rate clock output
for use by an external data source:
Positive clock transitions
correspond to data transitions.
A receive data rate clock output
for use by an external data sink:
Positive clock transitions
correspond to data transitions.
A positive level causes the modem
to enter the local analog loopback
test mode.*
Installation
2-5