Black Box Short-Haul Modems Wiring Configuration

Block Diagram Wiring Excellon Short-Haul Black Box Modems
The Black Box Short-Haul modems are used in a pairs configuration.
Short Haul Modem Wiring

Description: Short-Haul Modem Model B Async (SHM-B Async)

Manufacturer: Black Box Corporation

Part Number: ME800

Short Haul Modem Connector Schematic

Cable Wiring: Computer to Modem

COM Port
DB-9 Socket		 Modem
DB-9 Plug		 COM Port
DB-25 Socket		 Modem
DB-25 Socket
Pin – Function
2 – Receive
3 – Transmit
5 – Signal Ground		 Function – Pin
Receive – 3
Transmit – 2
Signal Ground – 5		 Pin – Function
2 – Receive
3 – Transmit
7 – Signal Ground		 Function – Pin
Transmit – 2
Receive – 3
Signal Ground – 7

Note: Pins not shown are not used.

Cable Wiring: Modem to Modem

+R ————– +T

-R ————— -T

+T ————– +R

-T ————— -R

Use the following procedure for testing modem connections:

  1. Connect modem to computer and machine.
  2. Plug modem into 115 VAC. Front panel LEDs (TD and RD) on modem should be green.
  3. Turn on computer and machine. Start CSS DNC Server.
  4. Send Operator Message. LEDs on modem should quickly blink Red.

According to Black Box specs, the short-haul modems are designed to transmit up to 4 miles (6.4 km) over 4-wire RS-232.

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