Difference between revisions of "Conrad DIGI 35 CPU"
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= Manual Operation = | |||
== Status on power up == | |||
Voltage and current are set to 0. | |||
== Setting Voltage (or special function) == | |||
U → <digit1> <digit2> <digit3> → U | |||
Output is disabled while setting. LED ''CONST V'' is on when output is enabled. | |||
When output is enabled, the voltage can be increased or decreased in steps of 100 mV with the ''UP/DOWN'' button. | |||
== Setting Current == | |||
I → <digit1> <digit2> <digit3> → I | |||
Output is disabled while setting. Display shows set value after third digit. | |||
= Resources = | = Resources = | ||
Revision as of 22:51, 13 January 2014
| Status | in progress |
|---|---|
| Channels | 1 |
| Voltage/current (CH1) | 0-35V / 0-2.55A |
| Connectivity | RS232 |
| Features | settable values, interval and timed power-off functionality |
The Conrad DIGI 35 CPU is a one-channel digitally-controlled laboratory power supply with RS-232 connectivity. It came onto the market in 1992.
Hardware
ICs
- Motorola 68HC05C4 (CPU)
- DAC-0802L (2x)
- LM-336 Voltage Reference
- TODO
RS-232 Interface
The RS-232 interface is equipped with a DB-9 socket in DTE configuration. It only receives data, but does not send any and uses no handshake lines.
Communication parameters 8n1, 9600 (power-on default), 4800, 2400 and 300 baud are supported.
To convert it to a more common DCE configuration, unplug and open the device and solder the RxD line from pin 2 of the DB-9 socket to pin 3.
Photos
- TODO
Protocol
ASCII based.
| Vxxx <CR> | Set voltage to xx.x V or set special function. |
| Cxxx <CR> | Set current to x.xx A. |
| L <CR> | Lock keyboard. |
| E <CR> | Enable keyboard. |
| U <CR> | Increase voltage by 100 mV |
| U <CR> | Decrease voltage by 100 mV |
Special functions:
| 5xx | Set interval 01-99 seconds. The output is switched on and off in the interval. Use with care because of wear of relay! Set to 00 to disable. |
| 6xx | Set countdown to 01-99 hours. After countdown has expired, the output is disabled. Set to 00 to disable. |
| 7xx | Set countdown 01-99 minutes. Can be combined with 6xx. Set to 00 to disable. |
| 800 | Set baud rate to 300. |
| 801 | Set baud rate to 2400. |
| 802 | Set baud rate to 4800. |
| 803 | Set baud rate to 9600. |
| 900 | Set current mode to overcurrent protection (reaching current limit disables output). |
| 901 | Set current mode to constant current (default). |
| 902 | Lock keyboard (unlock via RS-232). |
Manual Operation
Status on power up
Voltage and current are set to 0.
Setting Voltage (or special function)
U → <digit1> <digit2> <digit3> → U
Output is disabled while setting. LED CONST V is on when output is enabled.
When output is enabled, the voltage can be increased or decreased in steps of 100 mV with the UP/DOWN button.
Setting Current
I → <digit1> <digit2> <digit3> → I
Output is disabled while setting. Display shows set value after third digit.