Motorola T721 Getting Started Manual page 138

Serial Cable
1 Plug the serial
2 With the Motorola
3 Plug the other end of the cable into the serial
136
Action
cable into the
detachable head.
Make sure that the
Motorola logo on
the detachable
head and the metal shielding on the serial cable
plug are both facing you.
logo and the phone
both facing you,
plug the
detachable head
into the phone's
accessory
connector port.
interface connection on the device and tighten
the screws, if present.