Sw Download (Version Update) - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
8.4.2.17 int WriteComm(idComDev, lpvBuf, cbWrite)
int idComDev;
const void FAR* lpvBuf;
int cbWrite;
The WriteComm function writes to the specified communications device.
int WriteComm(idComDev, lpvBuf, cbWrite)
Parameter Description
idComDev Specifies the device to receive the bytes. The OpenComm function returns this value.
lpvBuf Points to the buffer that contains the bytes to be written.
cbWrite Specifies the number of bytes to be written.
Return value The return value specifies the number of bytes written, if the function is successful.
< 0 if an error occurs, making the absolute value of the return value the number of bytes written.
Example None
Comments To determine what caused an error, use the GetCommError function to retrieve the error value and
status.
For serial ports, the WriteComm function deletes data in the transmission queue if there is not
enough room in the queue for the additional bytes. Before calling WriteComm, applications should
check the available space in the transmission queue by using the GetCommError function. Also,
applications should use the OpenComm function to set the size of the transmission queue to an
amount no smaller than the size of the largest expected output string.
See also GetCommError, OpenComm, TransmitCommChar
8.5

SW download (Version update)

The Flashloader functions under Windows 95/98/NT for updating and loading SW into the M20 module via the serial
interface of the M20Terminal. An implementation of SW download without using the M20T module is also described.
8.5.1 M20: HW setup
For Downloading SW into the M20 without the use of the M20T, following preparations have to be made to enable M20
to communicate with the PC via the serial interface cable.
Tools and components required:
If not already installed on the application a minimum serial interface 1) between the M20 and a computer is required.(The
signals RTS, CTS, DSR and DTR are not necessary for SW-update.)
M20 pins Signal
18-22, 58-62 DC_IN
17, 23-25, 38, 43, GND
56, 57, 63-65
8 IGNITION
30 BOOTCODEEN
74 POWER_ON
10 USCRX
72 USCTX
Note:
1) The signals RTS, CTS, DSR and DTR are not necessary for SW-update.
Version 8 dated 15.03.00
/* identifier of comm. device
/* address of data buffer
/* number of bytes to write
Comments
-
-
Connect IGNITION to DC_IN
2
) Provide a switch between BOOTCODEEN and POWER_ON.
A level shifter from 2.8 V logic to V.24/RS232 is required (must be
connected to pin 3 on a computers 9-pin Sub-D serial port)
A level shifter from 2.8 V logic to V.24/RS232 is required (must be
connected to pin 2 on a computers 9-pin Sub-D serial port)
*/
*/
*/
Application notes
A
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