Agilent Technologies L4400 manual 34945EXT Module, Electro-static discharge

7Microwave Switch/Attenuator Driver

Figure7- 2 is a labeled drawing of the 34945EXT remote module.

Bank 1
Ch 1 - 8	Expansion Bus
Ch 11 - 18
Bank 2
Ch 21 - 28
Ch 31 - 38
Bank 3	Port 2
Ch 41 - 48
Ch 51 - 58	Port 1
Bank 4
Ch 61 - 68	External Power
Ch 71 - 78
I/O Access LED	Supply Connections

Figure 7-2. The 34945EXT Module.

Each 34945EXT has an I/O Access LED used to indicate transactions between the L4445A and the 34945EXT module. When power is first applied to a 34945EXT module, this LED is continuously illuminated.

After the module has booted, the LED illuminates only intermittently during programming operations.

Should the L4445A encounter problems communicating with the 34945EXT the LED is continuously illuminated.

LED	Meaning
Not Illuminated	Power is not applied to the module or the
	module is not processing commands.
Continuously	The 34945EXT is not booted, either due to
Illuminated	an internal error or an L4445A error.
Blinking	Normal operation during command
Intermittently	transactions. Send the
	SYSTem:CTYPe:RMODule? query to
	initiate a transfer and blink the LED.

N O TE	Always tighten the screws securing the L4445A sub-assembly to the
	instrument carrier assembly, and the screws on both ends of the D-Sub
	cable. Incorrect grounding can cause malfunctions of the modules due to
	electro-static discharge.

140 L4400 User’s Guide