Radiometrix Ltd

QPX1 Data Sheet

page 5

Serial Programming

Serial data is sent to the unit on the programming input PGM (pin 14)

2400 baud at RS232 level. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control. All commands

must be in upper case.

To successfully program the unit, 'ENABLE' (pin 4) must be 'high' (active) to enable the unit.

Once 'modem' mode has been selected, the unit locks into serial command mode (and the parallel port pins

have other functions) until a SETPAR command returns the unit to ordinary parallel operation.

Unlike earlier Radiometrix multichannel units, the QPX1 (and USA versions of SMX1) has separate N and R

registers for each channel, on transmit and on receive. In other words, the frequency of each channel is

individually programmed in every mode.

Unless a complex frequency map has been selected, all the R value registers are likely to be programmed

with the same value

Command

Function

GOCHAN a

serial select of channel a (ch0 to 7)

LDTXN a nnnnn

set value of N for channel a , for transmit

LDRXN a nnnnn

set value of N for channel a , for receive

LDTXR a rrrrr

set value of R for channel a , for transmit

LDRXR a rrrrr

set value of R for channel a , for receive

SETPAR

channel selected by 3 bit parallel input 3

SETSER

channel selected by most recent 'gochan' operation

RVALUE rrrrr

set R register value used by SINGLE command

SINGLE nnnnn

set value of N for single channel operation. N value NOT stored in

e2prom

SETMOD

Enable internal modem. Frequency selected by most recent 'gochan' or

'single'

<cr>

process entry

/

clear all buffers

#

disable command mode

a = a single digit channel number from 0 to 7

nnnnn = a synthesizer N register value, (up to 65535)

rrrrr = the synthesizer R register value, (up to 16383)

For Transmit,

R

kHz

10

quency

ChannelFre

N

For Receive,

R

kHz

10

4

.

21

quency

ChannelFre

N

rx

−

=

kHz

25

Hz

10

f

f

R

cing

channelspa

Xtal

=

=

Note:

In 'SINGLE' mode the unit is inoperative after a power down until either another valid SINGLE

command is received, or mode is changed by a GOCHAN, SETPAR or SETSER command.

Single mode applies a receive frequency offset of 21.4MHz

'Single' mode is intended for frequency agile applications.

A pause of at least 50mS must be allowed between command strings (eeprom programming time)