© Microhard Systems Inc. 24
3.0 Hardware Features
Table 3-3: COM2 DB9 Pin Assignment
Pin Name No. Description In/
Out
DCD 1 Data Carrier Detect O
RXD 2 Receive Data O
TXD 3 Transmit Data I
DTR 4 Data Terminal Ready I
SG 5 Signal Ground
DSR 6 Data Set Ready O
RTS 7 Request To Send I
CTS 8 Clear To Send O
See Appendix A for a full description of the COM1 RS-
232 interface functions.
Serial Port (Continued)
SIM Card
This slot is used to install a SIM card provided by the cellular carrier to enable communication to their
cellular network. Ensure the SIM card is installed properly by paying attention to the diagram printed above
the SIM card slot.
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