365-575-102 Detailed Level Procedure: DLP-521
Issue 8.0, July 2002 Page 9 of 10
Table B. Pin Connections for Modem Using DB-25 Cable
PC DB-25 Connector
(Note) CIT
Pin 1 - Protective Ground Protective frame ground.
Pin 2 - Transmit Data Transmits data to the modem
Pin 3 - Receive Data Receives data from modem
Pin 4 - Request to Send CIT is requesting clearance from the modem so it
cansenddata.
Pin 5 - Clear to Send Modem notifies the CIT that it is clear to send
data.
Pin 6 - Data Set Ready Modem notifies the CIT that the modem is
connected.
Pin 7 - Signal Ground Signal ground
Pin 8 - Carrier Detect This modem detects carrier from the remote
modem.
Pin 20 - Data Terminal
Ready
CIT notifies the modem that it is connected.
Note: All remaining pins are not connected.
Table C. Pin Connections for Modem Using DB-9 Cable
PC DB-9 Connector CIT
Pin 1 - Carrier Detect This modem detects carrier from the remote modem.
Pin 2 - Receive Data Receives data from modem.
Pin 3 - Transmit Data Transmits data to the modem.
Pin 4 - Data Terminal Ready CIT notifies the modem that it is connected.
Pin 5 - Signal ground Signal ground
Pin 6 - Data Set Ready Modem notifies the CIT that the modem is connected
and ready to receive data.
Pin 7 - Request to Send CIT is requesting clearance from the modem so it can
send data.
Pin 8 - Clear to Send Modem notifies the CIT that it is clear to send.
Pin 9 - Ring indicator Modem notifies the CIT that ring signal is present
when the modem is in an auto-answer mode.
To Next Page
Loading...
Need help?
General