Instruction manual

2
1. Operation of ZM-300 Main Menu 2-5
LCD Control Terminal Operations
2-1. Self-loop Test
This is a signal test for communications through the CN1, MJ1 or MJ2 connector. Perform
this test if the communication is not successful when transferring screen data through MJ1,
connecting the PLC using CN1, or selecting multi-link 2, PLC2Way or PLC for MJ1/2, or
connecting the ZM-1REC or ZM-322ME.
CN1: RS-232C Signal Test
Turn the [CN1] and [RS232C] switches on.
• SD/RD Test
Check the signals [SD] and [RD].
1. Install a jumper between pins 2 and 3 of CN1 on the backside of the ZM-300 unit.
2. Press the [Self-Loop Test] switch. When the [OK] lamp lights up, the test is
successfully completed.
• CTS/RTS Test
Check the signals [CTS] and [RTS].
1. Install a jumper between pins 4 (RTS) and 5 (CTS) of CN1 on the backside of the
ZM-300 unit.
2. Press the [RTS] switch and check that both [RTS] and [CTS] lamps light up at the
same time. Press the [RTS] switch again and check that both [RTS] and [CTS]
lamps go off at the same time.
CN1
RS232C
MJ1 RS485
MJ2
Communication Port
Self-Loop Test
CTS RTS
NG OK
Self-Loop Test
CTS RTS
NG OK
Self-Loop Test
CTS RTS
NG OK
Self-Loop Test
CTS RTS
NG OK
Self-Loop Test
CTS RTS
NG OK
Self-Loop Test
CTS RTS
NG OK