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int rn_find(rn_search *srch);
Locates the first active device that matches the search criteria.
PARAMETER
srch is the search criteria structure rn_search:
unsigned int flags;
unsigned int ports;
char productid;
char productrev;
char coderev;
long serialnum;
//
//
//
//
//
//
status flags see MATCH macros below
port bitmask
product id
product rev
code rev
serial number
Use a maximum of 3 macros for the search criteria:
RN_MATCH_PORT
RN_MATCH_PNA
RN_MATCH_HANDLE
RN_MATCH_PRDID
RN_MATCH_PRDREV
RN_MATCH_CODEREV
RN_MATCH_SN
//
//
//
//
//
//
//
match
match
match
match
match
match
match
port bitmask
physical node address
instance (reg 3)
id/version (reg 1)
product revision
code revision
serial number
For example:
rn_search newdev;
newdev.flags = RN_MATCH_PORT|RN_MATCH_SN;
newdev.ports = 0x03; //search ports 0 and 1
newdev.serialnum = E3446C01L;
handle = rn_find(&newdev);
RETURN VALUE
Returns the handle of the first device matching the criteria. 0 indicates no such devices were found.
SEE ALSO
rn_device
int rn_echo(int handle, char sendecho,
char *recdata);
The peripheral card sends back the character the master sent. This function will check device information
to determine that the peripheral card is connected to a master.
PARAMETERS
handle is an address index to device information. Use rn_device() or rn_find() to establish the
handle.
sendecho is the character to echo back.
recdata is a pointer to the return address of the character from the device.
RETURN VALUE
The status byte from the previous command. -1 means that device information indicates the peripheral
card is not connected to the master.
User ’s Manual
137
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