Compaq M-LVDS manual Point-to-Point Parallel Terminated Simplex Transmission

Typical Cable Test Configurations

2.1.2Point-to-Point Parallel Terminated Simplex Transmission

1)Connect a twisted-pair cable from P1 to P2.

2)Verify resistor R4 and R7 are installed.

3)Remove resistors R5 and R6. This properly terminates the transmission line at both ends.

4)Enable the driver by connecting the jumper on W2 between pin 1 and pin 2, or U1 pin 4 to VCC.

5)Enable the receiver by connecting the jumper on W1 between pin 2 and pin 3, or U1 pin 3 to GND.

Figure 2−2. Point-to-Point Parallel Terminated Simplex Transmission

VCC

Signal Source

with 50-Ω

Output

50-Ω

Cable

J2

TP2

		Jumper
Input Signal		W2
4	9
5		R7		R6
			P2
U1		100		100
R3	10
49.9				Twisted Pair Cable

			50-Ω		R2
50-	Ω	cable or	Cable	J1			12
					453	2
							R4
Active Voltage						U1	100
Probe into one						3
					TP1		11
Channel of Scope							VCC
Terminated in
High Impedance							W1
				Output Signal
			Active Voltage				Jumper
			Probe

P1	R5
	100

2.1.3Two-Node Multipoint Transmission

1)Connect a twisted-pair cable between P1, P2, and P3.

2)Verify resistor R5 and R16 are installed.

3)Remove resistors R4, R6, R7, and R15. This properly terminates the transmission line at both ends.

4)Enabling the driver in a two-node multipoint configuration will be a slightly more challenging task. The user can either jumper enable a single driver and send all of the data on the bus through a single driver, or sync the driver enable to the data and send data from each driver. Enable a single driver by connecting the jumper on W4 between pin 1 and pin 2 which

connects U2 pin 3 to VCC, or by connecting the jumper on W2 between pin 1 and pin 2 which connects U1 pin 4 to VCC.

5)Enable the receivers by connecting the jumpers on W1 and W3 between pin 2 and pin 3, or U1 pin 3 to GND and U2 pin 2 to GND.

Test Setup 2-3