iRZ ATM2-232, Руководство по эксплуатации

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Fig. 2.5 DB9 connector
Table 2.1 The LLS connector pin assignments
Pin Signal Direction Function
1 DCD Modem
– device
Carrier Detect
2 RXD Modem
– device
Receive Data
3 TXD Device
– modem
Transmit Data
4 DTR Device
– modem
Data Terminal Ready
5 GND
–
Ground Connected to the negative
terminal of the power supply
6 DSR Modem
– device
Data Set Ready
7 RTS Device
– modem
Request To Send
8 CTS Modem
– device
Clear To Send
9 RI Modem
– device
Ring Indicator
Note!
The RS232 (COM port) standard does not allow hot plugging. To prevent damage to the COM port,
wait at least 5 seconds to plug and unplug connected devices after turning off the power.
The DCD, DSR, CTS, RING pins can be set to a high or low state in the encapsulation mode (see section
“Encapsulation mode”
) or in the service mode using the ATM Control application. By default, the DCD, DSR,
CTS pins are set to a high state, RING
– to a low state.
The modem supports operation with the COM port via the Modbus protocol. There are two protocol imple-
mentations available
– Modbus RTU and Modbus ASCII.
Modbus RTU
– the packet data protocol used for communication with external devices via RS232, RS485
and RS422. When operating in the GPRS network, overload of base stations might cause data link failure. The