Black Box LR1530A-R3, LR1530A-EU-R3 manual Figure C-12 RS232 / V.24 Null-Modem Cable

Servicing Information

RS232 / V.24 Null-Modem Cable

DB25 MALE					DB25 MALE
	1	Shield	Shield	1
	2	Transmitted Data	Received Data	3
	3	Received Data	Transmitted Data	2
	4	Request To Send	Data Set Ready	6
	6	Data Set Ready	Request To Send	4
	20	DTE Ready	Received Line Signal Detector (CD)	8
	7	Signal Ground	Signal Ground	7
	8	Received Line Signal Detector (CD)	DTE Ready	20
	15	Transmit Timing DCE Source	Receiver Timing DCE Source 17

17	Receiver Timing DCE Source	Transmit Timing DCE Source	15
24	Transmit Timing DTE Source	Transmit Timing DTE Source	24

Figure C-12 RS232 / V.24 Null-Modem Cable

The connecting cable must be a shielded cable.

This cable is needed when it is necessary to connect two units back-to-back and a set of modems is not available. Note that this cable specifies DB25 connectors on each end to allow direct connection to the link interface connector on each unit. The link speed must be defined for each of the two units.

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