GSM modem iRZ MC52iWDT
User Manual
7
2.5.
Interfaces
2.5.1.
Connector DB9 (RS232)
The connector is used for connection to the control device, exchange protocol RS232.
9
8
7
6
5
4
2
3
1
Fig.2.5.1 Connector DB9
Table 2.5.1 Purpose of the connector pins.
Pin
Signal
Direction
Purpose
1
DCD
Modem-PC
Availability of carrier wave
2
RXD
Modem-PC
Data reception
3
TXD
PC-Modem
Data transmission
4
DTR
PC-Modem
Availability of data receiver
5
GND
general
System housing
6
DSR
Modem-PC
Readiness of data
7
RTS
PC-Modem
Request for transmission
8
CTS
Modem-PC
Availability of transmission
9
RI
Modem-PC
Call signal