SYSTEM CONNECTOR INTERFACE
40
LZT 123 8020 R1A
Input capacitance
< 2 nF
Input resistance (pull-up)
100 k
Ω
to DGND
Clear To Send (CTS)
CTS is asserted by the DCE to indicate that the host (DTE) may
transmit data. When CTS is high, the host (DTE) is not
permitted to transmit data.
The table below shows the load characteristics for this signal.
Parameter Limit
Application load capacitance
< 500 pF
Application load resistance
≥
1 M
Ω
Data Terminal Ready (DTR)
DTR indicates that the DTE is ready to receive data. It also acts
as a hardware ‘hang-up’, terminating calls when switched high.
The signal is active low. You can define the exact behaviour of
DTR with an AT command.
Data Set Ready (DSR)
DSR indicates that the DCE is ready to receive data. The signal
is active low.
Data Carrier Detect (DCD)
DCD indicates that the DCE is receiving a valid carrier (data
signal) when low.
Ring Indicator (RI)
RI indicates that a ringing signal is being received by the DCE
when low. You can define the exact behaviour of RI with an AT
command.
5.9.4
UART2 - TD2, RD2
UART 2 consists of a full duplex serial communication port with
transmission and reception lines.
This communication port works in a mode called Operation and
Maintenance.
Operation and Maintenance mode works in combination with
the SERVICE signal. Two events are possible if the SERVICE
signal is active when the radio device is turned on. These are:
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