C-4
MODEL 2700 APPENDIX C
TROUBLESHOOTING GUIDE
TOP VIEW OF ELECTRONICS MODULE
** *
** *
* * *
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*- - - - - - 2 - -* *
*- - - - - - 4 - -* *
*- - - - - - 6 - -* *
* ETC * *
*- - - - - 20 - -* *
* P7 * *
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FRONT
Tx Enable P7-9
Txd P7-11
Rxd P7-12
With a Multimeter:
When the Cube powers up and the Isolated 485 com-
munication is idle, the “Tx Enable” should be 5 volts with
respect to BLK (TB2-3). Measuring the voltage on P7-9
is tricky; you may want to make the connection with
power off, to avoid shorting pins together.
With a Scope:
“Rxd” shows incoming data, “Txd” outgoing. Voltage
levels are 0 volts and 5 volts with respect to BLK.
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