Sierra Wireless EV-DO Connecting your device to the Serial Port

PinPoint-E EV-DO
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ToturnontheDTRdigitalsensinginthemodem,*DTRI
shouldbesetto1.ToturnontheRTSdigitalsensing,*RTSI
shouldbesetto1.DTRIwillrespondtopin4ontheserial
port.RTSIwillrespondtopin7.
Tip: To use only DTR or only RTS, you only need to configure the
one you will be using.
ToallowmonitoringreportstobesentasaRAPmessage,
enable*PPINPUTEVTbysettingitto1.
Connecting your device to the Serial Port
YoucanconnectastandardRS232serialcabletothePinPoint‐E
serialport.IfyouwanttousetheDTRswitch,wireina
NormallyOpenswitchbetweentheDTR,pin4,andsignal
groundofpin5,theexternalcase,orthepowerground.Refer
tothefiguresbelow.IfyouwanttousetheRTSswitch,use
RTS,pin7,totheground.IfyouareusingbothDTRandRTS
switches,youcanusethesamegroundforboth.
Caution: Never apply voltage to the DTR or RTS inputs. DTR and
RTS can only be switched open or closed to ground.
Tip: You may be able to purchase a customizable serial cable to use
with DTR and RTS inputs. Contact your Sierra Wireless represen-
tative for more information.
Whentheswitchisclosedandwith*PPINPUTEVT
configured,aRAPreportwillbesenttothedestinationIP
addressindicatingthatacontactclosurehastakenplace(an
externalphysicaleventhasoccurred).RefertotheGPSchapter
formoreinformationontheRAPprotocol.
Figure 6-2: Serial Port Diagram: Female DB-9 DCE (not to scale)
5
4
3
2
1
9
8
7
6
< - > GND (Ground)
< - DTR Data Terminal Ready)
< - Rx (Receive)
- > Tx (Transmit)
- > DCD (Data Carrier Detect)
Unused
CTS (Clear to Send) < -
RTS (Request to Send) - >
DSR (Data to Send) < -