Socket Cordless Serial Adapter User Manual page 35

Pin Assignments
Pin # Direction Function
1 IN
2 IN
3 OUT
4 OUT
5
6 IN
7 OUT
8 IN
9
Power Mechanisms:
The CSA operates from DC power and can be powered via one of two
mechanisms:
1. From the Power Jack on the CSA.
When supplying DC power to the power jack, please note the following:
• The acceptable supply voltage for normal operation ranges from 3.5
to 5.5 VDC, with an Absolute Maximum is 5.6V.
• The Power supply must rise to its final voltage in less than 1mS.
• For specifications of the power jack's physical connector, refer to
SMK part number LGP3131-0111 at http://www.smk.co.jp.
2. From Pin 9 of the DB-9 Connector.
The acceptable supply voltage ranges from 3.5 to 12 VDC, with an
Absolute Maximum of 12V.
The CSA was not intended to be connected directly to a vehicle's
electrical system, although a cigarette lighter adapter/DC charger is
permissible.
The typical current requirements are provided in the table below.
Note: The power supply should be capable of supplying a minimum of
200 mA to ensure proper operation.
Mode
Connected
Connected standby
(RS-232 transceiver off)
Waiting to connect
Waiting to connect standby
(RS-232 transceiver off)
APPENDIX A: SPECIFICATIONS
DCD — Carrier detect
RXD serial data from local host
TXD serial data to local host
DTR Data terminal ready
Ground
DSR Data set ready
RTS Request to send to local host
CTS Clear to send from local host
Optional power input (3.3 to 5.0 Vdc)
Average
40.5
3.5
39.1
2.3
Max Units
76.5 mA
53.0 mA
55.9 mA
19.1 mA
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