Remote-processing RPC-210 Manuel d'utilisateur télécharger pdf (Page 19)

SERIAL & SPI PORTS BASIC SECTION 4

Page 4-1

Figure 4-1 Serial Com munication Ports

DESCRIPTION

SERIAL PORTS SECTION 4

The RP C-210 has two ser ial ports that inter face to

printers, terminals, RS-485 network, or other serial

devices. A clock and data lines for SPI com patible

devices is also available. This section d escribes their

characteristics and how to use them.

Serial por ts are num bered C OM 0 and CO M1. COM 0 is

RS-232 only and is used for program deve lopment.

During r un time, it can be used for other functions.

COM 1 is a general purpose port and is jumperable for

RS-232 or RS-422/485.

Each port has a 256 character interrupt driven input and

output buffer. This allows characters to be sent out

(using PRINT) without slowing down program

execution. However, if the PRINT buffer fills, program

execution is suspended until all PRINT charac ters ar e in

the buffer. Both ports have a 256 character input buffer.

When more than 256 char acters are r eceived, excess

ones are ignored.

CONFIG BAUD controls baud rate and RS-232/485

mode (COM1 only).

ON C OM$ is useful whe n data is sent in pac kets. This

multitasking command branches to a BASIC subroutine

when a specific character or number of chara cters is

received.

COM1 UART uses INT0 interrupt. This interrupt may

be used with the real time clock, counter/encoder, or for

external interrupts at J8-6 or J7-3. COM 1 uses this

interrupt for serial comm unications. If you ne ed to use

INT0 for the real time clock or external use, then you

can not use COM1 for serial communication.

COM0 SERIAL PORT

This port at J1 uses a VTC-9F serial cable to connect

external serial devices to the port. The cable consists of

a 10 pin IDC connector wired one-to-one to a DB-9

connector . L ine 10 is simply cut off. The pin out is

designed so it plugs directly into the 9 pin serial port

connector on a PC.

COM 0 is normally used for program ming. D uring run

time it may be used as a general purpose serial port.

When used for programming or with the INPUT

statement, it accepts ASCII chara cter value s from 0 to

127. When used with the GET function, it will return

ASCII values from 0 to 255.

COM 0 does not have handshaking lines.

RPBASIC-52 Programming Manual difference

CONFIG BAUD 0,0 does not output 38,400. W hen a

baud code 0 is entered, the rate will be 57,600.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 59 60

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Remote-processing RPC-210 Manuel d'utilisateur Page 19

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