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2.6.3 Digital I/O Card Function Calls
2.6.3.1 Digital Input Function Calls
int rn_digIn(int handle, int channel,
char *retdata, int reserved);
Reads the undeglitched or raw data state of the selected digital input channel.
PARAMETERS
handle is an address index to device information. Use rn_device() or rn_find() to estab-
lish the handle.
channel is the digital input channel (0–23) to read.
retdata is a pointer to the return data address of the logic state.
reserved is reserved for future use. Set to 0.
RETURN VALUE
The status byte from the previous command, and a pointer to the return data logic state (0 or 1) of the
input. -1 means that device information indicates the Digital I/O Card is not connected to the master.
SEE ALSO
rn_digOut, rn_digBankIn
int rn_digBankIn(int handle, int bank,
char *retdata, int reserved);
Reads the undeglitched or raw data state of a block of designated digital input channels. The first bank
consists of channels 0–7, the second bank consists of channels 8–15, and the third bank consists of
channels 16–23.
PARAMETERS
handle is an address index to device information. Use rn_device() or rn_find() to estab-
lish the handle.
bank is the bank to read.
0 for all banks on the card
1 for bank of digital inputs 0–7
2 for bank of digital inputs 8–15
3 for bank of digital inputs 16–23
retdata is a pointer to the return data address of the logic state.
reserved is reserved for future use. Set to 0.
RETURN VALUE
The status byte from previous command, and a pointer to the return data byte where each bit corresponds
to one channel. Channels 0, 8, and 16 are considered to be the bit 0 positions. If all the banks are
requested, the pointer to the bank 1 data byte is returned with subsequent byte pointers to the next two
banks. -1 means that device information indicates the Digital I/O Card is not connected to the master.
SEE ALSO
rn_digIn, rn_digBankOut
34
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