Intermec 073290-001 User Manual

Full handshaking is supported, except for RI (Ring Indicate). This was left 
out in anticipation of some DB9 cables supplying +5V, instead of RI, on 
DSub pin 9. 

U23 and its charge pumps are left on while the CK30 is on, but it draws 
very little current with no RS-232 device attached. It is shut off during 
Suspend by the DOCK_EN signal from HCR register U11. The 
MAX3244 AutoShutdown mode is not used because it doesn’t wake up 
and restore RS-232 level conversion fast enough if the CK30 suddenly 
starts transmitting, causing data corruption. 

U23’s CD_WAKE output is always active, even when U23 is shut down 
during Suspend. This allows the RS-232 DCD* signal to propagate 
through U23 and wake the system if it is docked with an active RS-232 
device. (This feature is not supported in the current software.) 

A full set of scanner interface signals is available on 26-pin docking 
connector J13. This is intended for support of “pick and run” applications, 
in which the CK30 may be docked in a vehicle dock that has a decoded or 
undecoded tethered scanner plugged in. It may also be used for Specials 
applications needing to support an internal and a tethered scanner. See 
“Tethered Scanner Support Through Dock Connector” on page 85 for 
details. 

Regulated 5V power is provided through the dock connector for powering 
tethered scanners.  This power is switched through high-side switch U13, 
controlled by the DOCK_EN signals from HCR register U11. This 5V 
power is normally powered off and the RS-232 chip disabled during 
Suspend, and is automatically shut off in hardware if the main battery is 
critically low or removed. 

A Class 2 Bluetooth link is supported through an optional module that 
plugs into Bluetooth connector J8. (A duplicate set of connector pads, J6, 
is provided for future support of larger Bluetooth modules.) The module 
includes its own chip antenna. 

The Bluetooth module is powered through FET Q9. Software normally 
drives control signal BT_PWR_EN* high (off) during Suspend for power 
savings. In future software releases, the Bluetooth module may optionally 
be left powered during Suspend to support system wakeup from an 
incoming Bluetooth message. Bluetooth power is automatically shut off in 
a critical battery situation by the “Type 1” interlock mechanism described 
in “Device Power Control” on page 58.