for the manufacture of digital load cells, weighing indicators, process control weighing instruments, tensile testing machine, and other weighing or force measuring occasions.
round modules are designed for embedding in the analog load cells and serving as a/d converters.
features and specifications：
★ measuring range: ±15mv
★ a/d resolution:1000000
★ temperature coefficient：≤5ppm／℃（typical）
★ hardwareinterface: rs-485interface, half-duplex.
★ software protocol: rectangle: freeport/ modbus rtu protocol (opt.)
round: freeport protocol
★ a/d conversion,digital calibration, tare, zero setting/tracking, switch-on zero setting,anti-dithering;
★ all the parameters can be set through serialinterface;
★ module addresses are availablefrom 0 to 31. modules can work through bus communication;
★ baud rate,parity bit and data output format can be set. 1200～38400bps;
★ digital filtering: standard filtering or lpf;
★ samplingspeed: 3.125～400hz;
★ storage ofthe parameters with protection against power failure;
★ operatingvoltage: 9v dc(6.5v～12v); operating current:≤40ma;
★ complete protection: wrong wiring protection, overvoltage protection, transient voltage suppression;
★ operating temperature range: -40℃～ 70℃; storage temperature range: -60℃～ 90℃
wiring diagram of setaq ad-s321：
if the rs485 signal wires are too long, or there are several ad-smodules are connected on the same bus, these modules may not be found due tolack of driving capacity. then please connect a module’s ra with 5v through a 1kω pull-up resistor r1, and connect the module’s rb with gnd through a 1kω pull-down resister r2. note that if there are severalad-s modules are connected on the same bus, you can only add a pull-up resistor r1 and a pull-down resistor r2 to the ad-s module which is the farthest from pcconverter or plc. if this does not solve the problem, you can also add a pull-up resistor r3 and a pull-down resistor r4 to the other end of rs485 wires.
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