User's Manual

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FIBOCOM N510-GL Hardware User Manual Page 36 of 56
 SIM card pull out, SIM_DET and SIM card socket pin 7 open circuit, SIM_DET is low level.
 SIM plug-in check function is turned off by default, and this function should be turned on through
software settings.
6.3.3 SIM Card Circuit Design Requirements
The circuit design of SIM card needs to meet the requirements of EMC standard and ESD. At the
same time, it needs to improve the anti-interference ability to ensure that the SIM card can work steadily.
The following points should be strictly observed in the design:
 The layout of SIM card holder is as close as possible to the module and away from strong
interference sources such as RF antenna, DCDC power supply and clock signal line.
 The SIM card with metal shielding case is adopted to improve the anti-interference ability.
 The line length from module to SIM card holder should not exceed 100 mm, too long line will reduce
the signal quality.
 SIM_CLK and SIM_DATA signals are packaged and isolated to avoid mutual interference. If it is
difficult to do so, at least SIM signals need to be protected as a group of packets.
 The filter capacitor of SIM card signal line and ESD device are placed near the SIM card holder. The
equivalent capacitance of ESD device should be 22-33 pF capacitor.
6.4 UART
6.4.1 UART Pin Description
The N510-GL module provides two UART interfaces for asynchronous serial communication with a
default baud rate of 115200. UART1 and UART2 interface supports AT command, but cannot be used at
the same time, The UART interface definition is shown in the following table:
Table6-8 Module UART Pin Description
PIN
Pin Name
I/O
Pin Description
Power
Domain（TYP）
15
UART1_DTR*
I/O
UART1 Terminal Ready
2.8V
16
UART1_DSR*
I/O
UART1 Data Set Ready
2.8V
17
UART1_DCD*
I/O
UART1 Data Carrier Detect
2.8V
18
UART1_RXD
I
UART1 Receive Data
2.8V
19
UART1_TXD
O
UART1 Transmit Data
2.8V
20
UART1_RTS
O
UART1 Clear To Send
2.8V
21
UART1_CTS
I
UART1 Request To Send
2.8V