IEEE-488 Reference
4-167
4.20
:SOURce subsystem
This subsystem is used to set the logic level (true or false) of each digital output line. The com-
mands for this subsystem are summarized in Table 4-27.
[:LEVel] <b>
:SOURce:TTL[1]:[LEVel] <b> Control digital output line #1
:SOURce:TTL2:[LEVel] <b> Control digital output line #2
:SOURce:TTL3:[LEVel] <b> Control digital output line #3
:SOURce:TTL4:[LEVel] <b> Control digital output line #4
Parameters
<b> = 1 or ON Set output line true
= 0 or OFF Set output line false
Formats
:sour:ttl <b>
:sour:ttl2 <b>
:sour:ttl3 <b>
:sour:ttl4 <b>
Defaults
Power-up OFF (all lines)
*RST No effect
:SYSTem:PRESet No effect
Query
:LEVel]? Query logic level of specified line
Short-form formats: :sour:ttl? :sour:ttl2?
:sour:ttl3? :sour:ttl4?
Response message: 0 (false) or 1 (true)
Table 4-27
SOURce command summary
Command Description
:SOURce
:TTL[1][:LEVel] <b>
:TTL[1][:LEVel]?
:TTL2[:LEVel] <b>
:TTL2[:LEVel]?
:TTL3[:LEVel] <b>
:TTL3[:LEVel]?
:TTL4[:LEVel] <b>
:TTL4[:LEVel]?
Set digital output line #1 true (1 or ON) or false (0 or OFF).
Query digital output line 1.
Set digital output line #2 true (1 or ON) or false (0 or OFF).
Query digital output line 2.
Set digital output line #3 true (1 or ON) or false (0 or OFF).
Query digital output line 3.
Set digital output line #4 true (1 or ON) or false (0 or OFF).
Query digital output line 4.
Notes:
1. Brackets ([ ]) are used to denote optional character sets. These optional characters do not have to be included in the program mes-
sage. Do not use brackets ([ ]) in the program message.
2. Angle brackets (< >) are used to indicate parameter type. Do not use angle brackets (< >) in the program message.
3. Upper case characters indicate the short-form version for each command word.
4. If a LIMITS control is enabled (LOLIM1 or 2, HILIM1 or 2 — High, Low, or Pass), this command does not check or change the out-
put status. Refer to paragraph 3.12.5 for information on limits.
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