Ericsson ZAT 19.2 Operation Manual page 290

45. Technical data.
Circuit 102 Signal ground
ITU-T name: GND RS232C name:AB Pin no.:7
Signal Ground is the reference for all Signal Voltages.
103 Transmitted data DTE->DCE
ITU-T name: TXD RS232C name:BA Pin no.:2
Data is transmitted from DTE on circuit 193 in serial binary form.
Circuit 106 (CTS) indicates that DTE can send data.
104 Received data DTE<-DCE
ITU-T name: RXD RS232C name:BB Pin no.:3
DCE sends received data from the line on circuit 104 in serial
binary form, providing that data carrier detect (109) is ON. If data
is not transmitted, circuit 104 is logic "1"
105 Request to send DTE->DCE
{ITU-T name: RTS RS232C name:CA Pin no.:4
State ON: Data may be sent, CTS is ON.
State OFF: The modem sends scrambled "1".
CTS is OFF.
106° Ready for sending DTE<-DCE
ITU-T name: CTS RS232C name:CB Pin no.:5
State ON:
Indicates that DCE is ready for data transmission.
State OFF:
Indicates that DCE cannot receive data from DTE.
107 Data set ready DTE<-DCE
ITU-T name: DSR RS232C name:CC Pin no.:6
State ON: The modem is connected to the line and ready for
data transmission.
State OFF: The modem is not ready for data transmission.
108/1 Connect data set to line DTE->DCE
ITU-T name: CON RS232C name:CD Pin no.:20
State ON: Connects the modem to the telephone line.
State OFF: Connects the line to the telephone set.
" The common meaning of «ON» and «OFF» is described here The actual way lo use the
Circuits is setup by the commands &S, &R and \Q
1 5-2 LZTR104006 R1.00
Zat14.4/14.4-7 and 19.2/19.2-7