A member of the Olancha Group Ltd
Registered in England No. 08405712
VAT Registration No. GB163 04 0349
Siretta Ltd
Basingstoke Road
Spencers Wood
Reading
Berkshire RG7 1PW
sales
fax
email
web
+44(0)118 976 9014
+44(0)118 976 9020
www.siretta.co.uk
21
ZETA Series
GPRS/UMTS/LTE Terminal with GPIO
RS232 Serial Port Interface
This connector provides a serial RS232 communication between the ZETA modem
and the connected equipment. The modem can be configured via the RS232
connection using AT commands as specified in the AT command manual.
Pin Name Usage
Status
Direction
1
DCD
Output from UART that indicates the carrier is present
Not Connected
OUT
2
RXD
Output transmit line of UART
Connected
OUT
3
TXD
Input receive line of UART
Connected
IN
4
DTR
Input to UART and controls DTE ready condition
Not Connected
IN
5
GND
Ground
Connected
IN
6
DSR
Output from UART that indicates the module is ready
Not Connected
OUT
7
RTS
Request to Send - Input line of UART that controls hardware flow control
Connected
IN
8
CTS
Clear to Send - Output line of UART that controls hardware flow control
Connected
OUT
9
RI
Ring Indicator - Output line of UART that indicates the incoming call condition
Not Connected
OUT
Table 5.
Pin usage
Figure 12.
RS232 serial port
RS232 port
Figure 13.
Pin numbering
5
9
1
6
Interfaces
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