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GSM20-CAB232 Datasheet(PDF) 6 Page - rfsolutions.ltd |
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GSM20-CAB232 Datasheet(HTML) 6 Page - rfsolutions.ltd |
6 / 26 page DS020-7 Oct ‘06 ©2006 REG No 277 4001, ENGLAND. Page 6 GSM100 USERS MANUAL 1.2.3. 15-PIN D-SUB Female connector (RS232 / Audio) - The connector provides serial link and audio link to the modem. Pin number Name EIA designation Type Note 1 DCD Data Carrier Detect Output 2 TX Transmit Data Input 3 BOOT Input Not used 4 MICROPHONE (+) Input 5 MICROPHONE (-) Input 6 RX Receive Data Output 7 DSR Data Set Ready Output 8 DTR Data Terminal Ready Input 9 GND Ground Ground 10 SPEAKER(+) Output 11 CTS Clear to Send Output 12 RTS Request to Send Input 13 RI Ring Indicator Output 14 RESET Input Pull low to reset 15 SPEAKER(-) Output Specification of microphone and speaker to be connected : Parameters Min Typical Max Remark Microphone current @2V / 2K Ohm 0.5 mA Microphone input level 100 mVpp Speaker output current 150 Ohm/ 1nF 16mA Speaker impedance 32ohm Please refer to the document “Application notes - Power supply & Audio” for more information of audio connection. 1.2.4. 4-PIN modem socket (Power, Input / Output) Pin assignment of 4-pin connector Pin number Name Functions 1 I/O Input / Output port 2 ~INTR Interrupt function triggered by pulling this pin to ground or LOW level; reserved for additional functions with new firmware 3 POWER - DC power negative input 4 POWER + DC power positive input |
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