Sharp PC-G850VS User manual

SHARP&PC-G850V(S)&&&Manual&

SHARP

POCKET COMPUTER

MODEL

PC-G850V(S)

User Manual/ Interface

SHARP&PC-G850V(S)&&&User&Manual&-&&Appendix!A:!11-Pin!Interface&

Version 1.1, 12/2016

SHARP&PC-G850V(S)&&User&Manual&-&Appendix!A:!11-Pin!Interface&

Appendix&A:&11-Pin&Interface&

Signals&and&Pin-Out&

On the left side of the PC-G850V(S) there is an 11-pin interface intended for

communication with other devices. It is a multi-functional interface, hence it can operate

in different (sub-)modes. The actual mode is selected through operational commands or

menue items of the PC-G850V(S).

1. SIO / RS-232C-mode (e.g. OPEN“COM:“)

2. SSIO-mode (Synchronous Serial Input/Output)

a. CE-126P print protocol (e.g. LPRINT without preceding OPEN)

b. LPRT-protocol (e.g. OPEN“LPRT:“)

3. PWM-mode (Pulse Width Modulation)

a. CE-126P tape protocol (e.g. BSAVE/BLOAD with a CE-126P)

b. Generic PWM-protocol (e.g. BSAVE/BLOAD with another PC-G850V)

4. PIO-mode (e.g. OPEN“PIO:“)

Programmable, 8-bit parallel port interface

5. PIC-mode (activated by the PIC-loader in the assembler menue)

Programming interface for PIC microcontrollers

The association of physical pins to logical signals (called pin-out) as well as the

configured direction for input (I) or output (O) depends on the active mode. The following

table gives an overview. Looking from the left side of the PC-G850V(S) pin-1 is the

leftmost and pin-11 the rightmost.

SIO-Mode

SSIO/PWM-Mode

PIO-Mode

PIC-Mode

Signal

I/O

Signal

I/O

Signal

I/O

Signal

I/O

VCC(+5V)

GND

RTS

BUSY

Bit0

I/O

DTR

DOUT

Bit1

I/O

CLK#

RXD

XIN

Bit2

I/O

DATAIN

TXD

XOUT

Bit3

I/O

DATAOUT

DIN

Bit4

I/O

LOWBATT#

CTS

ACK

Bit5

I/O

DSR

EX1

Bit6

I/O

EX2

Bit7

I/O

The next sections describe the SIO-mode and respective connection options in detail.

The other modes are covered subsequently.

SHARP&PC-G850V(S)&&&User&Manual&-&&Appendix!A:!11-Pin!Interface&

SIO-Mode:&RS-232&Standard&and&Conventions&

The PC-G850V(S) in SIO-mode exposes the signals of the RS-232 standard, but with

different voltage levels (see below). This section provides the necessary basics of the

standard and covers some specifics of the PC-G850V(S).

Within the RS-232 standard the terms DTE (Data Terminal Equipment) and DCE (Data

Communication Equipment) are introduced. The DTE is the PC-G850 for example and

the DCE is a modem or another peripheral device, like a serial printer.

When two computers shall communicate directly (i.e. without a modem), you need a so

called null-modem (cable/adaptor), which connects the outputs of one DTE with the

inputs of the other and vice versa (crossed signals).

Typically 25-pin (Sub-D 25 / DB-25) or 9-pin (Sub-D 9 / DB-9) plugs and jacks are used

to connect RS-232 capable devices.

SHARP&PC-G850V(S)&&User&Manual&-&Appendix!A:!11-Pin!Interface&

The pin-out and meanings are summarized in the following table.

Signal

Name

Alternative

Name

Direction

(DTE-

View)

Semantics

Pin#

DB-9

Pin#

DB-25

TXD

Transmitted Data

Out

Data from DTE to DCE

RXD

Received Data

Data from DCE to DTE

RTS

Request To Send

(Ready To Send)

Out

DTE requests permission

from DCE to send data

RTR

Ready To Receive

DTE is ready to receive

data from DCE

CTS

Clear To Send

DCE is ready to receive

data from DTE

DTR

Data Terminal Ready

Out

DTE interface ready for

operation

DSR

Data Set Ready

DCE interface ready for

operation

Carrier Detect

DCE detects remote DCE

(e.g. telephone line)

Call Indicator

Call of a remote DCE

GND

Signal Ground

None

Signal-ground (reference)

Frame Ground

None

Shield

Remark:

In the late 1980’s there was a shift in the meaning of the RTS-signal:

Originally the DTE (computer) requests the DCE (modem) for permission that the DTE

may send data - and the DCE “answeres” via CTS. But this protocol is asymmetric

because the DTE has no means to notify the DCE to wait for internal computations when

the DCE sends data. For this reason “Request To Send” was re-claimed: The DTE

requests the DCE to send data – or in other words, the DTE is “Ready To Receive”

(RTR). RTR and CTS are now independent of each other and the protocol between DTE

and DCE is symmetric. But in most cases the name “Request To Send” (RTS) was kept,

hence it is fairly ambiguous.

The PC-G850V(S) implements the newer, symmetric RTR-semantics (but the signal

name RTS has been kept). This is in contrast to the preceding pocket computer model

PC-E500(S), which implements the original RTS meaning and therefor needs the

XON/XOFF-protocol in addition, when it reads data/programs from a PC. The PC-

G850V(S) sets the DTR-signal to HIGH, when the SIO-interface is active, but it does not

care about the DSR-input. So there is no DTR/DSR-handshake. The RTS/CTS-

handshake, or alternatively the XON/XOFF-protocol can be configured in the

TEXT/Sio/Format-submenue by the item "flow".

SHARP&PC-G850V(S)&&&User&Manual&-&&Appendix!A:!11-Pin!Interface&

SIO-Mode:&Signal&Levels&

The next table summarizes the logic- and voltage-levels of the RS-232 standard in

comparison with UART-TTL and the PC-G850V(S).

Logic

level

Voltage level

Semantics for data

signals (RXD,TXD)

Semantics for

control signals

(RTS,CTS,etc.)

RS-232

LOW

-15V to -3V

1 (Mark), Idle, Stop

Inactive

HIGH

+3V to +15V

0 (Space), Start

Active

UART-TTL

LOW

0 (Space), Start

Active

HIGH

+3,3V / +5V

1 (Mark), Idle, Stop

Inactive

PC-G850V(S)

LOW

1 (Mark), Idle, Stop

Inactive

HIGH

0 (Space), Start

Active

So the PC-G850V(S) exposes inverted UART-TTL level signals in SIO-mode, just as

most other SHARP pocket computers do. That means the logic is identical to the RS-232

standard (HIGH=0/active), but the voltage level is TTL.

ð In order to connect peripheral devices with the PC-G850V(S) that operate at

RS-232 voltage levels, a level converter is mandatory!

The state of the TXD- and RTS-signals in SIO-mode is undefined, except for the

following cases:

1. The interface has explicitly been opened in SIO-mode (e.g. OPEN“COM:“) when in

operational main mode “BASIC”.

2. R- or W-commands are executed in operational main mode “Monitor”.

3. Data transfer via SIO in operational main mode “TEXT”.

SHARP&PC-G850V(S)&&User&Manual&-&Appendix!A:!11-Pin!Interface&

SIO-Mode:&Data&Transfer&Cable&CE-T800&and&CE-T801&

The data transfer cables CE-T800 and CE-T801 are RS-232 level converters with an

integrated null-modem wiring. They can be used to connect the PC-G850V(S) to a

personal computer (PC) or other devices.

With these cables you can transfer data, program source-code or machine language

programs from or to a PC by using the TEXT/Sio-submenue or the SIO-commands (R,

W) of the integrated hex-monitor (MON). The DB-25 plug of the cable can be connected

directly to a PC (if necessary via a DB-9 adaptor), when there is a physical COM port.

Alternatively it can be connected to a USB-port through an additional serial-to-USB

adaptor. Don't use a null-modem adaptor or wiring for a PC-connection (because it's

already integrated in the cable).

However if a peripheral RS-232 device like the 4-color plotter CE-515P shall be

connected, a null-modem adaptor/wiring is mandatory in order to compensate the

integrated one.

On the CE-T800 pins 6 and 20 are not connected, pin 11 is not connected on both

models (CE-T800 and CE-T801).

Attention: Never touch the pins of the DB-25 plug. Static electricity may be harmful for the

circuits.

A free working area of about 300bytes is required for data transfer from a PC.

SHARP&PC-G850V(S)&&&User&Manual&-&&Appendix!A:!11-Pin!Interface&

SIO-Mode:&USB&PC-Adaptor&Cable&with&Hardware-Handshake&&

An elegant, hence powerful DIY-alternative for the connection of the PC-G850V(S) with a

modern PC is based on a pre-built USB-UART adaptor cable with open endings.

Specification:

FTDI USB-UART/TTL adaptor cable based on FT232R-chip, 5V, 6 pins

(GND,5V,RXD,TXD,RTS,CTS)

For physical connection with the 11-pin interface of the PC-G850V a common multi-pin-

connector with 2.54mm spacing can be used. You need to solder the UART-lines of

adaptor to the multi-pin-connector by using a null-modem wiring then:

FTDI-UART

Signal (Color)

PC-G850V(S)

Signal (Pin)

GND (black)

GND (3)

RXD (yellow)

TXD (7)

TXD (orange)

RXD (6)

CTS (brown)

RTS (4)

RTS (green)

CTS (9)

VCC (red)

Additionally there should be a 10kOhm resistor between pin-4 and pin-3 of the multi-pin-

connector. It serves as a pulldown for the RTS-signal, to get a defined LOW level.

Without it, you might experience I/O-errors when transferring data from a PC to the PC-

G850V(S), because the PC may not receive wait requests from the pocket computer.

Finally you have to download the tool FT_PROG from the website of the manufacturer:

www.ftdichip.com. With this tool you must logically invert the signals RXD, TXD, RTS and

CTS of the FTDI-chip, because the SIO-mode (RS-232 interface) of the PC-G850V(S)

operates on inverted UART-logic (see above). This is a one-off process and the settings

are persisted within the integrated EEPROM of the FTDI-chip.

SHARP&PC-G850V(S)&&User&Manual&-&Appendix!A:!11-Pin!Interface&

SIO-Mode:&RS-232&Printer&

With the SIO-mode you can also make use of printers that provide an RS-232 interface,

like the 4-color plotter CE-515P or CE-516P.

Do not connect an RS-232-printer to the PC-G850V(S) without a voltage level converter!

The data transfer cable/converter CE-T800/801 can be used in combination with a null-

modem wiring or adaptor. To connect the CE-515P/516P via RS-232 a DIN-4 plug is

needed. The correct wiring (inluding null-modem) is as follows:

Be sure to have the DIP-switches on the back side of the CE-515P/516P configured

correctly (see printer manual for details).

Furthermore you have to adopt the RS-232 parameters in the TEXT/Sio/Format sub-

menue of the PC-G850V(S) in order to get a connection with the CE-515P:

• baud rate = 1200

• data bit = 8

• stop bit = 1

• parity = none

• end of line = CR

• flow = RS/CS

Now, to actually direct outputs to a RS-232-printer, you have to open the 11-pin interface

explicitely in SIO-mode (OPEN“COM:“) – and close it after use (CLOSE). Character-

strings and control codes are transmitted via the PRINT#1,“...” command in

between.

OPEN“COM:“

PRINT#1,“HELLO WORLD“

…

The commands LPRINT, LLIST, LFILES however are not routed to the 11-pin interface

in SIO-mode.

DIN-4 Plug

CE-T800/1 DB-25 Plug

Pin#

Signal

Pin#

Signal

+12V

BUSY#

RTS

GND

DATA#

RXD

SHARP&PC-G850V(S)&&&User&Manual&-&&Appendix!A:!11-Pin!Interface&

10!

SSIO-Mode&&

The SSIO-mode serves for the purpose of synchronous serial data transfer – in contrast

to the asynchronous serial data transfer of the SIO-mode. “Synchronous” means, that the

sender provides an additional strobe/clock signal, to which the receiver aligns. This

makes an explicit baud-rate obsolete, to which both sides have to be configured in SIO-

mode. Hence the settings of the TEXT/Sio/Format-submenue are irrelevant in SSIO-

mode.

The SSIO-mode provides different submodes resp. protocols.

SSIO-Mode:&CE-126P&Print&Protocol&

This is the default protocol for the 11-pin interface of the PC-G850V(S). It is the protocol

for the printer CE-126P and it is active if and only if there is no other (sub-)mode

selected. The commands LPRINT, LLIST and LFILES are routed to the printer in this

mode.

The integrated cassette interface of the CE-126P can also be used by the PC-G850V(S)

and the respective protocol shares the handshake with the print protocol, but it uses

PWM for data transfer instead of SSIO (see below).

The pin-out and signal semantics within the CE-126P print protocol is as follows:

Signal

Direction

Semantics

BUSY

Out

Clock pulse for synchronous, serial data transmission

DOUT

Out

Data line

XIN

No function

XOUT

Out

HIGH: CE-126P sub-device select (i.e. printer vs.

cassette interface) resp. command transfer

LOW: Idle or data transmission

DIN

No function

ACK

CE-126P ready to receive data or commands

(handshake)

EX1

No function

EX2

No function

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