F35-XXL Hardware description - Falcom

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F35-XXL HARDWARE DESCRIPTION VERSION 1.10 8 Getting started 8.1 Determining the External Equipment Type Before you connect the F35-XXL(-SI) terminal (DCE unit) to external equipment, you need to determine if the external hardware serial ports are configured as DTE or DCE. The terms DTE (Data Terminal Equipment) and DCE (Data Communications Equipment) are typically used to describe serial ports on devices. Computers (PCs) generally use DTE connectors and communication devices such as modems and DSU/CSU devices generally use DCE connectors. As a general rule, DTE ports connect to DCE ports via straight through pinned cables. In other words, a DTE port never connects directly to another DTE port. Similarly, a DCE port never connects directly to another DCE port. The signaling definitions were written from the perspective of the DTE device; therefore, a Receive Data signal becomes an input to DTE but an output from DCE. The F35-XXL(-SI) is designed for use as a DCE unit. Based on the aforementioned conventions for DCE-DTE connections it communicates with the customer application (DTE) using the following signals: GSM Terminal (DCE) to Application (DTE) TxD_SER3 ◄----------------------- TXD RxD_SER3 -----------------------► RXD RTS_SER3 ◄----------------------- RTS CTS_SER3 -----------------------► CTS DTR_SER3 ◄----------------------- DTR DSR_SER3 -----------------------► DSR DCD_SER3 -----------------------► DCD RING_SER3 -----------------------► RING Table 11: The signaling definitions between DTE and DCE. This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 51
F35-XXL HARDWARE DESCRIPTION VERSION 1.10 8.2 Minimum hardware interface to get started As a minimum, it is necessary to connect the following signals, which are available on the 120-pin board-to-board connector to properly operate the F35-XXL(SI) module: PIN NAME DESCRIPTION LEVEL 109, 113 GND 115,117, 119 VC5 (POWER) 104 VBATT 99 AVREF 103 AVDD 101 AVGND 33 RxD_SER0 31 TxD_SER0 4-pin Molex (interface A) DC power negative input DC power positive input recommended to connect Necessary if analog inputs are used Necessary if analog inputs are used Necessary if analog inputs are used debugging port RXD /dev/ser0 (DEBUG PORT) TXD /dev/ser0 (DEBUG PORT) Table 12: Description of minimum hardware interface. Ground Input +5 V DC Input +3 V DC Refer to pin-out on the table above Refer to pin-out on the table above Refer to pin-out on the table above Input Output Please refer to the chapter 11 “Evaluation board for F35-XXL”, too. This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission. Page 52
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F35-XXL Hardware description - Falcom

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