Socket Mobile Cordless Serial Adapter User Manual
Page 35
Pin Assignments
Pin # Direction Function
1
IN
DCD — Carrier detect
2
IN
RXD serial data from local host
3
OUT
TXD serial data to local host
4
OUT
DTR Data terminal ready
5
Ground
6
IN
DSR Data set ready
7
OUT
RTS Request to send to local host
8
IN
CTS Clear to send from local host
9
Optional power input (3.3 to 5.0 Vdc)
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
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
Average
Max
Units
Connected 40.5
76.5
mA
Connected standby
(RS-232 transceiver off)
3.5
53.0
mA
Waiting to connect
39.1
55.9
mA
Waiting to connect standby
(RS-232 transceiver off)
2.3
19.1
mA
APPENDIX A: SPECIFICATIONS
35