WorldPhone Liberator – Chapter 5. Appendices
C-18
Appendix C – DTE interface cont’d
DTE interface cont’d
102 Signal Ground
Digital ground, return line.
103 Send Data
Data transmitted from DTE (PC) to DCE (WorldPhone).
104 Receive data
Data Received from DCE (WorldPhone) to DTE (PC).
105 Request To Send
OFF requests DCE (WorldPhone) to suspend transmission to DTE (PC).
ON requests DCE (WorldPhone) to resume transmission to DTE (PC).
106 Clear to send
OFF indicates that DCE (WorldPhone) cannot accept data from DTE (PC).
ON indicates that DCE (WorldPhone) is prepared to accept data from DTE
(PC).
107 Data Set Ready
Signal from WorldPhone that when ON indicates that a data call setup is in
progress.
108 Data Terminal Ready
Signal from PC. This signal is used in the Hotline mode and indicate when
going from OFF to ON that the PC wants to make a data call. The PC
clears the call by setting the signal from ON to OFF.
109 Receive Signal Indicator
Signal from WorldPhone that when ON indicates that connection is
established and received data will be delivered on circuit 104, Received
Data.
125 Ring Indicator
Signal from WorldPhone. This signal is used in the Auto answer OFF
mode and when ON indicates that an incoming call is in progress. The
signal will go OFF when the call is answered by the PC by turning circuit
108 Data Terminal Ready ON.
Signal descriptions
