Where on the BAS PIU does the third party RS-485 LAN connect?
Type D hardware UNC532
The BAS PIU is based on the UNC532 controller with the RS-485 connection originally documented incorrectly as B1,B2 on PL10.
The BAS PIU RS-485 connection needs to be via C1 (+), C2(-) on PL2. Note: a link needs to be created between TXD and RXD on PL4.