String Length Limit on AXC-232???

TurnipTruck
TurnipTruck Junior Member
in AMX Hardware
Does anyone know what the limit is on how many character an AXC-232 can send in one transmission?

I have a system with in which about 300 characters need to go out it one transmission. From the same Netlinx master, an NXI serial port puts them all out as does an Axcent 3 in slave mode. However, an AXC-232 running in an AXF-BP with a card server from the Netlinx master seems to truncate some characters.

Thank you!
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  • Marc Scheibein
    Marc Scheibein Junior Member
    I can remember that somewhere in the Technotes was a table about hardware transmit and receive buffer sizes, but I haven't found it again......

    AFAIK the maximum string length is 64 bytes in one SEND_STRING on the AXcess RS232 ports.
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  • Chip Moody
    Chip Moody Junior Member
    It's tech note 156... Technically, anything pre-Netlinx shouldn't accept a SEND_STRING message longer than 64 bytes, so I'm suprised that Axcent3 works with 300!

    According to the note, Netlinx processor com ports and NXC-COM2 cards can handle up to 900 bytes going out on a SEND_STRING...

    - Chip
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  • Marc Scheibein
    Marc Scheibein Junior Member
    Chip Moody wrote:
    It's tech note 156... Technically, anything pre-Netlinx shouldn't accept a SEND_STRING message longer than 64 bytes, so I'm suprised that Axcent3 works with 300!

    According to the note, Netlinx processor com ports and NXC-COM2 cards can handle up to 900 bytes going out on a SEND_STRING...

    - Chip

    ARGL..... I have searched with keywords like "serial" "buffer", etc and had no hit :confused:
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  • mush
    mush I programme in the dark!
    Marc Scheibein wrote:
    ARGL..... I have searched with keywords like "serial" "buffer", etc and had no hit :confused:

    http://www.amx.com/techsupport/PDNTechNote.asp?id=156
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  • TurnipTruck
    TurnipTruck Junior Member
    In the case of needing to send a string longer than the limit for the hardware, what is the best method?

    I'm thinking that one would parse out some amount of bytes less than the limit, send, then repeat until all bytes are sent. If this is the case, what would be the best way to determine that it's clear to send the next load of bytes?

    Thank you.
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  • Chip Moody
    Chip Moody Junior Member
    I think I'd estimate time needed for a WAIT or TIMELINE based on the max sized chunk of data going out at any time * baud rate... 64 bytes * 10 (rounding up) = 640 bits, even at 960 bits per 1/10 second (9600/10) means you could easilly get away with a WAIT 1...

    - Chip
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