Telenetics MIU Dial or Leased Line modem with RS-485 - Manual (Page 15)

CIU Installation, Operation & Diagnostics Edition: June 17, 2003
Page C-1
SB-1 Closed(ON) DC Terminated
SB-2 Closed (ON) Line Termination
SB-3 & -4 Open (OFF) 4- wire
SA-1 Open (OFF) RTS follows CTS no delay
SA-2
Open (OFF)
SA-3 Closed (ON) RTS (always ON by MIU internal J7 (1/2)
setting) enables TxEN)
SA-4 Open (OFF) TxD will not disable RxD
MIU S3 (external)
SW-1 Closed (ON) MIU is configured for RS485 Module (RS485 RxD
(Output) to Modem TxD (input))
SW-2, -3 & -4 Open (OFF)
SA2 & SA3 can be configures for TxD enable TxEn signal if there
are several master locations in the network.
SA2 is Closed (ON) TxD (transmit data) enables TX (Driver Output Enable)
+ 5ms
SA3 is Open (OFF) TxD will not disable RxD
MIUXXXX/485 Final Connection
Ensure that MIUXXXX/485 J7 (internal jumper) 1/2 is connected
APPENDIX C. CONNECTOR DIAGOSTICS
RS485
CONNECTION FAILURE