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

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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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Contents Short-Haul Modem B SHM-B Async SHM-B Async SHM-B Async SHM-B Async Trademarks Used in this Manual Distance miles/km SpecificationsOperating Temperature 32 to 112F 0 to 50C SHM-B Async Introduction Four-Wire Connections InstallationSHM-B board 5-screw terminal block EIA-232 Connection Wiring diagram for two SHM-B unitsEIA-232 Pin Connections on SHM-B Switch SettingsPinning with DTE/DCE switch in the DCE position Flow Control ON/X-OFF Mode Operation Activating the Loopback switchSHM-B Async Rackmount Installation SHM-B Async Troubleshooting Guide SHM-B Async SHM-B Async SHM-B Async SHM-B Async SHM-B Async Copyright 2000. Black Box Corporation. All rights reserved