3M MP220 Installation Guide - Page 10

Interfacing (MP225 only) Serial Output The MP225 can interface with computers, printers (GA42), Acquire Data Acquisition software and other RS232 compatible devices via the RS232 cable. The maximum source or sink current available is ± 10mA. Pin Signal Pin 1 device enable (link to pin 5) 6 2 RS232 Tx (signal transmit) 7 3 not used 8 4 not used 9 5 protective ground (0V) Signal not used not used not used not used Data Socket protective ground (0V) signal transmit 5 1 9 6 Type of communication - uni directional, baud rate 2400, data format - 7 data bits : 1 stop bit : even parity 10 n Data is sent to the Data socket at measurement endpoint (manual or automatic), calibration recall and memory recall. n To use the output to monitor continually, you need to select continuous data transfer mode. Recorder Output An output is available for both modes. The polarity of the output is the same as the polarity of the input signal. Approximate Recorder Outputs pH - Output follows display and provides approximately 60 mV output/pH unit. This value varies with changes in electrode slope and temperature. mV - Output follows display, i.e. output varies from -1999 to 1999 mV. Recorder output is not available for temperature. Rec Socket Polarity 0V data output