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GPRS6055 Module Programming

This chapter shows you how to program and use your GPRS6055. It provides a general

description of the I/O map. Detailed serial port programming tips are not within the scope of this

manual.

Defining the Memory Map

The memory map of the GPRS6055 occupies a group of eight bytes of host PC I/O space. This

window is freely selectable by the user by jumpers JP7 for the GSM BASE. After setting the base

address you have access to the internal resources of the GPRS6055 control logic. The board

also has 16 digital I/O lines that can be accessed several ways.

Digital I/O

The 16 digital I/O bits have different functionality in COM17045 and GPRS6055 modes.

COM17045 mode is designed to be software compatible with the RTD COM17045 GSM/GPS

module which is 8 outputs and 8 inputs. GPRS6055 mode, which is the default, allows bit

programmable direction for all bits. Note the digital I/O registers can be accessed at 400h and

404h – 407h above the GSM.

COM17045 Mode (JP8 = COM17045)

ADDR (hex) REGISTER DIR COMMENTS

GSM BASE + 400h Digital I/O I/O Digital I/O Port

GPRS6055 Mode (JP8 = GPRS6055 -- Default)

ADDR (hex) REGISTER DIR COMMENTS

GSM BASE + 400h Digital I/O I/O Digital I/O Port

GSM BASE + 404h Digital I/O I/O Digital I/O bits 0 - 7

GSM BASE + 405h Digital I/O I/O Digital I/O bits 8 – 15

GSM BASE + 406h Digital I/O Dir I/O Digital I/O direction bits 0 - 7

GSM BASE + 407h Digital I/O Dir I/O Digital I/O direction bits 0 - 7

Digital I/O – R/W at BASE + 400h

This register is intended for COM17045 compatibility. If you are using the board in GPRS6055

mode, please use registers at BASE + 404h – 407h.

This address is used to interface to the digital I/O port of the GPRS6055, writing to this address

will transfer the data out of the output port, while reading from this address will return the data

from the digital inputs. The digital I/O is accessed at GSM BASE + 400h. This register is

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 30 31

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Siemens MC55 User Manual Page 19