The 3174 Model 51R is a table-top remote controller that supports the EIA 232D/CCITT V.24/V.28 or CCITT V.35 interfaces for SDLC, BSC, or X.25 remote link attachment. The Model 61R supports up to eight 3270 devices and eight ASCII devices.

NOTE: When ordering this controller a Communication cable must be specified: V.24 or V.35.