iHP Manual 65 | P a g e
Analog Current Source (ACS) - The module operates as a current source. The module output current can
only be controlled by inputting 0V-10V to module’s 0-10VEXT_IPROG signal (module J1 connector pin3) or
0V-5V to module’s 0-5VEXT_IPROG signal (module J1 connector pin4).
Module operating mode can be change via ISOCOMM Command D3h. Module operating mode can be check
via reading Module Command D3h. Table 4-15 lists the module nominal settings and the output range
configurability.
Table 4-15
DVS and AVS Output
Voltage Range (5% to
120%)
DCS and ACS Output
Current Range (0% to
100%)
4.4 Digital Control
The user can control the module’s output voltage or current using a PC or laptop when the module is
configured in digital control. A wide range of digital commands is supported. Module commands are specific
to an individual module at the module level. ISOCOMM commands are higher-level system commands such as
when controlling a group of modules. Many of the commands are fixed but several are user configurable. A
list of the user configurable commands specific to the modules and example of the command structure is
shown in Section 5.2. Definition of all the Module Commands is in Appendix B.2, Module Command.
Definition of ISOCOMM Command is in Appendix B.3, ISOCOMM Command.
4.4.1 Digital Voltage Source (DVS)
In this operating mode, the user has the capability to control the output voltage using digital means. A PC or
laptop will be required to change the output voltage. To change to Digital Voltage Source (DVS) mode, the
user needs to send below commands to ISOCOMM.
*Before writing to the ISOCOMM, please ensure that the ISOCOMM Command Write Protect (10h) is disabled.
Where: Data1 please refer to ISOCOMM Command Table
Data2 “00h” signifies Digital Voltage Source
After sending ISOCOMM Command D3h, the modules will momentarily shutdown, re-initialize, and then
restart. The shutdown, re-initialize, and restart process takes approximately 1.5 seconds. Since the module
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