CFGN(3)

✨ CFGN — the "configure n meters" byte generator ✨

okay bestie, welcome to CFGN(3) from the Utility Functions corner of the manual 💅 this one lives in linux-gpib and it's a lil function with a big job. let's get into it 🫶

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🎀 NAME 🎀

CFGn — generate 'configure n meters' command byte

like that's literally her whole thing. she makes a byte. one byte. iconic behavior honestly 👑

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🌸 SYNOPSIS 🌸

#include <gpib/ib.h>

uint8_t CFGn(unsigned int num_meters);

yep that's the whole vibe. one header, one function, one argument, and a uint8_t coming back out the other side ✨

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🦋 DESCRIPTION 🦋

okay so listen. CFGn() returns a 'configure n meters' command byte that corresponds to the num_meters argument you hand her. that's it, that's the mission.

num_meters is telling the function how many meters of cable are in your system. valid values are 1 through 15 — so don't go throwing 0 or 16 or 9000 at her, she has a range and she's sticking to it 🚫

and why do we care about cable length, you ask? because this is lowkey a prerequisite situation. you need this before high speed non-interlocked handshaking (a.k.a. HS488) can be used on the bus. so if you were trying to flex with HS488 but your meters info was missing, that's the whole reason it wasn't working. mystery solved 🔍✨

⚠️ important note before you run off: the CFGn command byte must be preceded by a CFE command byte to take effect. no CFE, no vibes. the byte just sits there being decorative 💀

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💖 RETURN VALUE 💖

the appropriate CFGn command byte gets returned. that's the one. the correct one. the matching one. she's giving exactly what you asked for, no cap 🙌

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👑 COPYRIGHT 👑

Copyright © 2003-2006, 2008 Frank Mori Hess

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aaaand that's the whole page bestie, you ate it 🍓 go forth and configure your meters responsibly 💜

linux-gpib 4.3.7 · 07/06/2026 · CFGN(3) 🎀