APPA 55II
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The APPA 55II is a logging thermometer with two thermocouple inputs and an optical RS-232 output. It supports K,J thermocouple types.
The device sends temperature measurements at approximately 3Hz to the host, but it acquire new mesure at only approximately 1Hz.
A clone is also sold under the name RS 55II (aka RS 615-8212).
Hardware
Thermometer:
- Fujitsu MB89P485 8-bit Proprietary Microcontroller.
- Microchip 24LC512 64 KB EEPROM.
- TI ADS1242 24-Bit, 4 Ch, delta-sigma ADC with SPI interface.
- TI OPA2335 dual opamp.
- TI OPA335 single opamp.
- NXP HEF4053BT triple SPDT analog switch.
USB cable:
RS-232 cable:
Photos
Those pictures are from the RS 55II clone.
Protocol
TODO