SC32A Optically Isolated RS232 Interface Revision: 1/93 C o p y r i g h t © 1 9 8 7 - 1 9 9 3 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The SC32A OPTICALLY ISOLATED RS232 INTERFACE is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
SC32A OPTICALLY ISOLATED RS232 INTERFACE 1. FUNCTION The SC32A interfaces an RS232 peripheral, commonly a computer or printer, to the Serial I/O of a CSI datalogger. The SC32A replaces the SC32. Functions include: other CSI dataloggers, the jumper has little effect and could be removed (Section 5). 2. SPECIFICATIONS Operating temperature: -25 to +50 °C (typical) 1. Converting datalogger logic levels to RS232 logic levels. Power: Powered by host devices, see "Operation" section 2.
SC32A OPTICALLY ISOLATED RS232 INTERFACE 4. OPERATION Power for the SC32A datalogger section comes from the 5V supply on pin 1 of the datalogger I/O. Communication logic levels to and from the datalogger are referenced to this voltage, ranging from 0 to slightly less than 5V. Power for the RS232 section is taken from the Data Terminal Ready (DTR) and Request To Send (RTS) lines of the RS232 peripheral. An on-board DC to DC converter supplies the negative voltage required for RS232 signals.
SC32A OPTICALLY ISOLATED RS232 INTERFACE 5.2 SC32A AND A CR10 DATALOGGER To understand where the SC32A can be used and the significance of the jumper, a short discussion of the datalogger I/O interaction is necessary. The CR10 enters telecommunications in two ways. Pin 5 enables phone modems and the SC32A for phone telecommunications.
SC32A OPTICALLY ISOLATED RS232 INTERFACE External power connections to the SC32A are given below: SC32A 25 PIN PORT PIN # EXTERNAL POWER SUPPLY Ensure that the ground of the RS232 device and the external supply are tied together. 4 and/or 20 + 1 and/or 7 - FIGURE 5.
SC32A OPTICALLY ISOLATED RS232 INTERFACE FIGURE 5.
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