ICP DAS USA I-7021 User Manual

Also see for M-7024: Quick start guide

Contents

ICP DAS USA I-7021 User Manual Manual pdf 182 page image

I-7021/22/24, M-7022/24/28 User Manual, Rev: B2.3182A.5 Analog OutputBesides setting by the analog output commands, theanalog outputs can be set by two other conditions.When the host watchdog is enabled and a host watchdogtimeout occurs, the “safe value” is loaded into the analogoutput ports. The analog output commands have no effecton the analog output ports until the host watchdog timeoutstatus is cleared. The host watchdog timeout status issaved in the EEPROM. The status is not changed evenafter power-on reset. It can be cleared only by the resethost watchdog timeout status command ~AA1. SeeSection A.2 for host watchdog details.When the module is powered on and the host watchdogtimeout status is cleared, the “power-on value” is loadedinto the analog output ports. If the host watchdog timeoutstatus is not cleared on power-on, then the safe value isloaded into the analog output ports.The safe value is set by the ~AA5 command for the I-7021and I-7021P, and by the ~AA5N command for the I-7022,M-7022, I-7024, I-7024R, M-7024, M-7024L, M-7024R,M-7024U and M-7028. The power-on value is set by the$AA4 command for the I-7021 and I-7021P, and by the$AA4N command for the I-7022, M-7022, I-7024,I-7024R, M-7024, M-7024L, M-7024R, M-7024U andM-7028.When the module receives the analog output command#AA(data) or #AAN(data), if the host watchdog timeoutstatus is not cleared, then it responds ‘!’ to indicate that thecommand is ignored. If the host watchdog timeout status