ZETRON 748, Technical Manual

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Programming
74 025-9368H
FILE TRANSFER ACCESS MODE
The File Transfer Access Mode is a method for accessing a Model 748 for uploading and down
loading of device configuration files, retrieval of billing data, and resetting the database and billing
records when necessary. This mode of operation is designed to support communications packages
with script languages, such as ProComm Plus. It can also be driven in a manual fashion using simple
terminal emulation software such as Terminal, found in Microsoft Windows. The Model 748
supports the Xmodem data transfer protocol for file transfers. All the commands accessible in the
mode are also available in the normal programming menus.
Access to the File Transfer Access Mode is identical to normal program mode access, either by
modem or local RS-232 port connection. Which mode is selected is determined by the password
entered. Normal program mode uses the “Program Access Code” as the password (default is 12748).
This is a fixed length, five digit number. All 16 DTMF tone-pairs are valid (0 to 9, A, B, C, D, *,#).
File Transfer Access Mode uses the same code, but with the last (or fifth) digit incremented by one
for its access code. As an example, if the program access code is “12748” the file transfer access
code is “12749”. Only the last digit is incremented, the first four digits will always be the same. The
fifth digit increments by one and if required, will wrap around from “#” to “0”.
COMMAND STRUCTURE:
File Transfer Access Mode uses simple commands to initiate actions by the Model 748. Commands
are always a two digit number sent in ASCII followed by a <CR> (an ASCII carriage return
character). All commands have a corresponding menu item in either the Accounting menu or the
Diagnostic menu. The commands fall into two categories; 1) File Transfers, and 2) Clear commands.
The File Transfer commands execute the same as if you had selected the item in the Accounting
menu. The timing to start the file transfer is also the same. The Clear commands as well operate just
as they would if chosen from the menu. Upon the successful completion of a command, the Model
748 respond by sending the ASCII string “OK <CR> <LF>”, indicating that it is now ready for the
next command. Unrecognized commands are responded to with the ASCII string “<NAK> (15)
<CR> <LF>”.
With one exception, all of the commands in Table 7 have a corresponding menu item associated with
it. These commands are just short cuts to execute them in File Transfer Access Mode. The command
# 90 has no corresponding menu item. Its primary use would be to identify the unit before file
transfers are started. This could help a script file decide how to name files during a download for
example.