HP 48g Graphing Calculator - Manual (Page 386)

The I/O Menu—Serial I/O Commands
Key Programmable
Command
Description
S)Q2o]SERIR:
!Rfc.
27
b i 1 f 11
XMIT
SRECV
STIME
SBRK
Sends the string in level 1 without
Kermit protocol. After the entire string
is sent, 1 is returned to level 1. If the
entire string failed to transmit, 0 is
returned to level 1 and the unsent part
of the input string is returned to level
2—execute ERRM to see the error
message.
Receives the number of characters
specified in level 1. For a successful
transfer, the characters are returned to
level 2 as a string, and 1 is returned to
level 1. For an unsuccessful transfer, an
empty or incomplete string is returned
to level 2, and 0 is returned to level 1—
execute ERRM to return the error
message. (An unsuccessful transfer
occurs if the characters contain a parity
error, framing error, or overrun error, or
if fewer than the specified number of
characters are received before the
timeout period expires, 10 seconds by
default.) Characters are taken from the
input buffer—no waiting occurs if you
specify the number of characters in the
buffer, which is returned by BUFLE.
Sets the serial transmit/receive timeout
to the number of seconds specified in
level 1. The timeout value can be from
0 to 25.4 seconds. If you specify 0, the
HP 48 waits indefinitely, which could
result in excessive battery drain.
Sends a serial BREAK signal.
27-18 Transmitting and Printing Data