User Manual

ZE51/61-2.4 RF Module User Guide
1VV0300868 Rev.4 – 31/03/2011
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 27 of 50
IV.4. Description of the Signals
Signals Description
Reset
External hardware reset of the radio module.
Active on low state.
TXD, RXD
Serial link signals, format NRZ/TTL:
TXD is for outgoing data. RXD is for incoming data.
The ‘1’ is represented by a high state.
CTS
Incoming signal. Indicates whether the module can send serial
data to user (Active, on low state) or not (inactive, on high state).
RTS
Outgoing signal. Indicates whether the user can transmit serial
data (active, on low state) or not (inactive, on high state).
IO
I/O, configurable as input or as output.
(Available upon request only)
STAND_BY
Indicates to the module to switch to pre-selected low-power mode.
(Available upon request)