Telenetics RM16M - Versatile Rack Mounting Chassis, Инструкция по установке и эксплуатации, Страница: 40 / 49

Digital Interface Descriptions
Page 40
Table C-1. Digital Interface Signal Descriptions (232-C)
Pin
No. EIA-
232C
CCITT Signal Name Description
10
−
12 volts
−
12 voltage reference
11 Not used
12 SCF Sec. Received
Line Signal
Detector Carrier detect on a secondary channel.
13 SCB 142 Sec. Clear to
Send Clear to send on a secondary channel.
14 SBA 141 Sec. Transmit
Data Transmitted data on a secondary channel.
15 DB Transmit Clock
(DCE) A transmit data clock output for use by an
external data source. Positive clock transitions
correspond to data transitions.
16 SSB Sec. Rec’d Data Received data on a secondary channel.
17 DD 115 Receive Clock A receive data rate clock output for use by the
external data sink. Positive clock transitions
correspond to data transition.
18 Not used
19 SCA 140 Sec. Request to
Send Request to send on a secondary channel.
20 CD 108.2 Data Terminal
Ready This circuit is positive when the DTE is
ready to originate or answer a call in dial up
operation.
21 SQ 110 Signal Quality
Indicator Signals on this circuit are used to indicate the
probability of an error in the received data. A
positive level indicates good signal quality
while a negative level indicates poor signal
quality.
22 CE 125 Ring Indicator In direct dial operation, this circuit is positive
in response to an incoming ring signal.
23 CH 111 Data Rate Select Supplies a data rate control to select Primary
or Fallback data rate.
24 DA 113 External
Transmit Clock A serial data rate clock input from the data
source. Positive clock transitions correspond
to data transitions.
25 Not used