User's Manual

1.0/November 1998 1891 1210

Section 2

Operation

2.1 USER CONNECTIONS

Connection to the ST500 transmitter is made via three headers, PL1, PL2 and PL3,

which plug directly into the user's own equipment. The location of these connectors is

shown in the General Arrangement drawing given at the back of this manual.

The details of these three connectors are detailed below:

PIN NAME FUNCTION REMARKS

1 0V 0 volts common ground

2 bT bXbE transmit enable o/c = transmitter disabled

LOW <+0.8V = transmitter enabled

1KÙ nom. internal pull-up to +Vin

3 DIGITAL I/P data input 0/+3V to 0/+12V, DC-coupled

4 ANALOGUE I/P data input 300mV to 5V p-p, AC-coupled

5 +5V O/P +5V supply output 50mA max. current drain

6 RS232 I/P serial programming

input

If not used leave un-connected or ground.

(refer to section 3.5 for details)

7 0V 0 volts common ground

8 RB1

parallel frequency

select

internal pull-up to +5V, active low

(refer to section 3.5.4 for details)

9 RB2

10 RB3

Connector PL1 pin detail