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Siretta Ltd
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23
ZETA-xxP Series
Hardware Manual
rev
D
Interfaces
RS232 Serial Port Interface
This connector provides a serial RS232 communication between the ZETA-xxP
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
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
Connected
IN
5
GND
Ground
Connected
IN
6
DSR
Output from UART that indicates the module is ready
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
Connected
OUT
Table 7.
Pin usage
Figure 15.
RS232 serial port
RS232 port
Figure 16.
Pin numbering
5
9
1
6
Supported baudrates
»
2400
»
4800
»
9600
»
19200
»
38400
»
57600
»
115200
»
230400