Agilent Technologies E1470A user manual Vxie

Writing to Relay Control	To set one or more relays write a “1” to the bit controlling that relay:
Registers	1. Determine the register and bit locations for the relays you want to set.
	2. Add the decimal values for each bit you want to set in a register.
	3. Use the VXI:REG:WRITe command to write that decimal value to that
	register.
	Examples: Writing to Relay Control Registers
	In these examples, since you are writing 1s to specific bits, the process
	actually writes 0s to all other bits in that register thus resetting those relays.
	To maintain previously established signal paths, you should read the
	register state and “mask” those bits when writing to the register.
NOTE
	If Bit 15 is a “1”, BASIC language programming uses a 2s compliment
	number so the decimal value is negative. For example, FFFFh = -1,
	8000h = -32768.
	If all relays are in their power-on/reset state, to set relay K002 (connect
	channel CH002 to COM 00), set bit 1 (decimal value 2) in register (base +
	20h). Use the commands:
				!Selects logical address
	VXI:E			!Writes value 2 to register 20h
	To set relays K001, K003, K014, K013, and K024 (connect CH 001 to
	COM 02) set bits			2, 7, 6, and 11 (decimal values 1, 4, 128, 64, 2048
	respectively), send the decimal value 2245 (1 + 4 + 128 + 64 + 2048 = 2245)
	to register 20h. Use the commands:
				!Selects logical address
	Similarly,VXI:REG:WRITto reset20,2245a relay to its power-on/reset state, write a “0” to the
	respective bit.
Reading from Relay	Use the VXI:REG:READ? command to read the value of a register. The
Control Registers	value returned is the decimal-weighted sum of all the bits in that register that
	are set to “” (relays in the “set” state). At power-on/reset, the value returned
	should be . Use the command:
	SL120			!Selects logical address
				!Reads from register base + 20h
	RG:WRIT20,2
	Examples: Writing to Relay Control Registers
	VXI:The followingE	table shows examples of the decimal values needed to write
	to a register(s) to connect signal paths. Hundreds more combinations are
	possible. These tables only show representative samples. Negative values
	are 2s compliment.
	SL120
Appendix B	SLRG:READ?120		20	Register-Based Programming 47