Specifications

Integra M2106+
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WA_DEV_M2106+_PTS_003-001 April, 2007
3.6 Serial Link
3.6.1 Interface Description
A serial link interface is available on the Integra M2106+ Wireless CPU
®
. It is compliant with V24 signaling
protocol with a 2.8 V electrical interface except TX, RTS, and DTR inputs, which can be either 5 V or 3 V.
This means the serial link not compliant with the V28 standard and a level shifter is required to connect to a
PC.
The available signals are:
• Tx data (CT103/TX),
• Rx data (CT104/RX),
• Request To Send (CT105/RTS),
• Clear To Send (CT106/CTS),
• Data Terminal Ready (CT108-2/DTR),
• Data Set Ready (CT107/DSR).
Two additional signals are necessary to have the complete RS232 signal set:
• Data Carrier Detect (CT109/DCD),
• Ring Indicator (CT125/RI).
Pin description
Signal Pin # I/O Reset State I/O type Description
CT103 / TX 25 I Pull down CMOS Transmit serial data
CT104 / RX 28 O Output high 1X Receive serial data
CT105 / RTS 30 I Pull down CMOS Request To Send
CT106 / CTS 13 O Output high 1X Clear To Send
CT107 / DSR 27 O Output high 1X Data Set Ready
CT108-2 / DTR 29 I Pull down CMOS Data Terminal Ready
CT109 / DCD 5 O High Z 2X Data Carrier Detect
CT125 / RI 9 O High Z 2X Ring Indicator
CT102 / GND 21,24…* -- Ground
* Any of the available GND pins can be used.