KEPCO KLN Series (750W, 1500W, 3000W), Main Contro Firmware Version 1.70 and higher - Manual (Page 77)

KLN Series 051614
3-31
3.5.6.2 MONITOR UNIT STATUS
The following status signals are open collector TTL signals via an optocoupler referenced to
Programming Control port pin 8: maximum voltage is 30V, maximum current is 8mA. See Figure
3-7. Status noted in Figure 3-7 is present when signal is TTL high, absent when TTL low.
FIGURE 3-7. PROGRAMMING CONTROL PORT STATUS MONITORING
3.6 DIGITAL REMOTE MODE PROGRAMMING
KLN models may be digitally programmed over a control bus using SCPI (Standard Commands
for Programmable Instruments). SCPI provides a common language conforming to IEEE 488.2
for instruments used in an automatic test system (see PAR. 3.7). The control bus used must be
either the RS-485 Serial Bus, or the optional IEEE 488 standard communication bus (General
Purpose Interface Bus, GPIB) or the optional LAN interface. Refer to PAR. 3.7 for a detailed dis-
cussion of SCPI programming.
Refer to Table 2-3 for input/output signal allocations for communication via the GPIB and Table
2-2 for RS-485.
This section includes the requirements for
• RS 485 Operation (see PAR. 3.6.1)
• GPIB Operation if option installed (see PAR. 3.6.2) including an explanation of GPIB bus
protocols (PAR. 3.6.2.1)
• LAN Operation if option installed (see PAR. 3.6.3)
3.6.1 RS-485 OPERATION
See PAR. 2.7.2 for RS-485 connections.
See PAR. 3.3.18 to change the RS-485 Address.
See PAR. 3.3.16 to change the RS-485 Baud Rate.
3.6.2 GPIB OPERATION (IF OPTION INSTALLED)
See PAR. 2.7.4 for GPIB connections.
See PAR. 3.3.17 to change the GPIB Address.
STATUS PIN DESCRIPTION
7 Unit power on
9
Alarm (OVP, OCP or output shut-
down applied to pin 23)
10 Output on/off
11 Constant Current (CC)
12 Constant Voltage (CV)