Telenetics MIU Dial or Leased Line modem with RS-485 manual Appendix C. Connector Diagostics

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 OutputEnable) + 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

CIU Installation, Operation & Diagnostics Edition: June 17, 2003

Page C-1