Rainbow Electronics MG260 - Manual (Page 38)

MG260 Product Specification
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agreement.
This serial link is used for AT commands communication, for GSM function only
(external mode) or for both GSM and GPS functions (internal mode).
Pin
description
Signal Pin # I/O I/O type Description
GSM_TXD1 59 I CMOS CT103 – Transmit Serial Data
GSM_RXD1 52 O 3X CT104 – Receive Serial Data
GSM_RTS1 50 I CMOS CT105 – Request To Send
GSM_CTS1 57 O 3X CT106 – Clear To Send
GSM_DSR1 56 O 3X CT107 – Data Set Ready
GSM_DTR1 54 I CMOS CT108-2 – Data Terminal Ready
GSM_DCD1 71 O CMOS/2X CT109 – Data Carrier Detect
GSM_RI1 74 O CMOS/2X CT125 – Ring Indicator
GSM_TXD1
GSM_RXD1
GSM_RTS1
GSM_CTS1
GSM_DSR1
GSM_DTR1
GSM_DCD1
GSM_RI1
GND
DTE
MG260 GSM
Serial Link
Figure 13: GSM serial link signals
The MG260 has been designed to allow a certain flexibility in the use of the serial
interface signals.
However, the use of GSM_CTS1 and GSM_RTS1 signals for hardware flow
control in order to avoid data corruption during transmission is mandatory.
This is not the case for GSM_DTR1 and GSM_DSR1 signals which can be left
disconnected if not used.