ADLINK HSL-DO32-M-N/HSL-DO32-M-P - Manual (Page 65)

52 HSL Slave Module
3.2.2 Jumper Settings
Since HSL is a serial transmission system, a terminator must be
placed at the end of the cable. Each TB has an onboard jumper
selectable terminator. The terminator must be enable only by
the last module.