Black Box Local Mux-6 User Manual page 17

LOCAL MUX-6
Table 3-1. Sub-Channel Connector Pin Assignment.
CCITT EIA
V.24 RS-232C
101 AA
102 AB
103 BA
104 BB
105 CA
106 CB
107 CC
109 CF
— —
NOTE: Pin numbers in parentheses are for the secondary channel
available when using a channel-doubler cable.
18
Pin Signal Name
No.
1 Protective Ground
7 Signal Ground
2 (14) Transmit Data
3 (16) Receive Data
4 (19) Request to Send
5 (13) Clear to Send
6 (21) Data Set Ready
8 (12) Receive Line
Signal Detector
(Carrier Detect)
9 +8 volts
10 -8 volts
Description
Chassis ground. May be
isolated from signal
ground.
Common signal and DC
power-supply ground.
Serial digital data from a
terminal or other source
into the Local Mux-6.
Serial digital data output
from the Local Mux-6.
A positive level to the
Local Mux-6 when data
transmission is desired.
A positive level from the
Local Mux-6 (if data
transmission is possible).
A positive DC voltage
(+8V) from the Local
Mux-6 indicating the unit
is powered.
A positive level from the
Local Mux-6 except when
either a sync loss occurs
or remote loopback is
performed.
These signals are
reserved for data-set
testing and for powering
miniature modems.