Remote-processing RPC-220 Manuel d'utilisateur télécharger pdf (Page 21)

SERIAL PORTS SECTION 4

Page 4-1

Figure 4-1 Serial Port Jumpers and Connectors

Figure 4-2 Jumper W3 Pin Num bering

INTRODUCTION

SERIAL PORTS SECTION 4

The RPC -220 has 1 hardware serial port. A second

software serial port is available. If the second port is not

needed, then these lines may be used for CTS/RTS

control on COM 0 or high voltage I/O to external

devices such as proximity sensors. The second serial

port is useful for sending to printers, displays, and other

non-time critical devices. Jum per block W3 is used to

enable CTS/RTS or the second serial port.

COM 0

COM 0 is a hardware UA RT directly from the C PU. It

may be programmed in any num ber of m odes. Refer to

the 80C552 data sheet file "8XC552OV.PDF" for more

program ming inform ation on the different modes.

All demo programs use COM0. Most operate the serial

port in polled mode. SERIA L/S ERIN T. C oper ates in

interrupt mode. Timer divider factors for different baud

rates are also given.

When using timer 1 as the baud rate generator, be sure

to initialize TL1 and TH1. When TL1 is not initialized

there is a delay before the first character is sent out after

a power up or reset. Usually, this is not a problem. But

if the first character must start right after reset, then TL1

must be initialized. T he delay could be 30 m illi-seconds.

Control Lines

Software CTS and RTS lines are available. These lines

are shared with other functions and ports on the card.

CPU ports P4.3 and P4.4 ar e used for CTS/ RTS,

TX1/RX1, or general purpose I/O at CPU port J3.

Jumper W3 connects the CPU to the RS-232 port U9.

Set the jumpers according to the table below.

W3 CPU Function

port

W3[1-2] P4.3 CTS or T x1

W3[3-4] P4.4 RTS or Rx1

The large F igure below, 4-2, show s W3 pin locations.

Square pad pin 1 is viewed from the component side.

SOFTWARE SERIAL PORT

J4 is also a second software serial port. These lines may

be used as CTS and/or RTS for COM 0. If one or more

of these lines is used for COM 0, then the software port

is not available.

Transmit and receive lines are taken from J4-4 (Receive)

and J4-6 (transmit). When using COM 0, these lines

must be broken from the cable.

Jumper W3 must be set to use either or both lines. Lines

P4.3 and P4.4 come from the CPU and also go to CPU

port J3. Set W3 as follows:

W3 CPU Function

port

W3[1-2] P4.3 CTS or T x1

W3[3-4] P4.4 RTS or Rx1

Review Figure 4-2 for jum per pin locations.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 46 47

Commentaires sur ces manuels

Pas de commentaire

Remote-processing RPC-220 Manuel d'utilisateur Page 21

Commentaires sur ces manuels

Produits connexes et manuels pour Ordinateurs Remote-processing RPC-220