Can I connect a credit card payment device to a POS? Post author By JMSCPOS Post date June 16, 2021 A Can I connect a credit card payment device to a POS? Yes, you can connect PAX S300 & PAX Q30 Device to JMSC POS. ← Can I connect the weight scale with JMSC POS? → What if I got stuck on any screen on POS?