Black Box ME805-C, Short-Haul Modem B, ME810, ME800A-R2 Operation, Activating the Loopback switch

SHM-B ASYNC

4. Operation

After completing the wiring and configuration procedure, slide the printed circuit card back into the case while pulling the data and power cables through the holes in the back panel. The front panel will snap into the front of the case when the printed circuit board has been completely pushed to the back of the case.

Connect the SHM-B to your equipment, then plug the wall transformer into its power source. Check the SHM- B operation at both ends of the loop by pressing the LOOPBACK switch, S2.

	TX+	RX+
TD	TX-	RX-		RD
(RS-232)	RX+	TX+	(RS-232)
RD	RX-	TX-		TD

SHM #1 in NORMAL mode.		SHM #2 in NORMAL mode.
	TX+	RX+
TD	TX-	RX-		RD
(RS-232)	RX+	TX+	(RS-232)
RD	RX-	TX-		TD
SHM #1 in LOOPBACK mode.		SHM #2 in NORMAL mode.

Figure 3. Activating the LOOPBACK switch.

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