Remote Processing RPC-150 - Manual (Page 13)

CHAPTER 4 SERIAL PORTS
RPC-150 Page 11
In this mode, you have access to the full 256 bytes.
If you don' t read the b uffer an d the buffer fills, all
subsequent characters are discarded. INKEY$(n)
m a y be u se d an y w he r e in th e pr o g ra m .
3. COM$(n) retrieves all characters in the buffer,
including < cr> ' s and other control co des. This
function is commonly used with ON COM$
multitasking statement. You can retrieve 128 of the
256 bytes in the serial buffer at one time.
SERIAL PORT FILE NUMBERS
CAM BASIC refer ences the ser ial I/O ports by file
numbers, similar to DOS. The following table shows
the corresponding file number to serial I/O por t and how
they are used w ith the various ports.
Description File Examples
C O M 1 1 PRINT "Hello"
PRINT #1," Hello"
INPUT A$
INPUT #1,A$
A$ = INKEY$(1)
C O M 2 2 PRINT #2," Hello"
INPUT #2,A$
A$ = INKEY$(2)
COM1 is J1, the console port. COM2 is J4, the primary
port.
COMMANDS
The following is a list of CAM BASIC commands used
for serial I/O. Var iations for many commands not listed
here. These co mma nds and func tions are ex plained in
the CAMBA SIC Programming Manual .
Comm and Function
C L E AR C O M $ Clears serial input buffer
C O M $ Returns string from buffer
C O N F I G BA U D Sets serial port parameters
C O N F IG C O M $ Configures port for ON
COM $(n) interrupt
INKEY$ Returns a character fr om the
serial buffer
I N P U T Receives string from port
LIST Outputs program listing
O N C OM $ Calls subroutine on serial
input
P R I N T Outputs data in various
form ats
TAB Tabs to predetermined
positions
SERIAL CABLE PIN OUT
The following is the pin out between the IDC connector
for the SBS-150 and the DB-9 connector to the PC or
term inal.
I D C DB-9 Description
1 4 D C D
2 3 RXD
3 2 TXD
4 1 DTR
5 5 Ground
6 n / c DSR
7 8 CTS out
8 7 RTS in*
9 n / c + 5 V
10 n / c RI
J1 and J4 conn ector pin o ut.
Pin J1 J4 Direction
1 n / c n / c
2 RXD RXD Input
3 TXD TXD Output
4 n / c n / c
5 Gnd Gnd
6 n / c n / c
7 n / c CTS Output
8 n / c RTS Input
9 + 5V + 5V source
10 n / c n / c