Specifications

<C#>
Introduction
<C#>-6 V.3229 / V.3229L
<Re
f
erence>
Installation
* Modem options may force these signals on or cause them to be ignored.
Table 1:
Pi
n
N
o.
EIA-
232D
CCI
TT
V.24
Signal Name Description
1 101 Shield Protective Ground
2 BA 103 Transmitted
Data
Serial digital data (to be modulated)
from a data terminal or other digital
data source: Synchronous data must
be accompanied by the modem
transmit clock (pin 15) or by an exter-
nal data rate clock (pin 24). Data
transitions should occur on negative-
going clock transitions; asynchro-
nous data does not require a transmit
clock.
3 BB 104 Received Data Serial digital data output to the DTE
interface: Sync data is accompanied
by an internal data rate (receive)
clock (pin 17) with negative-going
transitions on the data transition.
Async data does not require a receive
clock.
4 CA 105 Request to
Send
A positive level to the modem when
data transmission is desired
5 CB 106 Clear to Send A positive level from the modem in
response to request to send and
when the modem is ready to transmit*
6 CC 107 Data Set Ready A positive level from the modem
when power is on and ready to oper-
ate. In dial-up operation, the modem
must be off hook to give a high DSR
signal.*
7 AB 102 Signal Ground
or Common
Return
Common signal and DC power
ground
8 CF 109 Received Line
Signal Detector
A positive level from the modem indi-
cating the presence of a received sig-
nal (carrier detect)*
9 +12 Volts +12 voltage reference
10 -12 Volts -12 voltage reference