Solution:

1. Before configuring the ADAM-4530, make sure it is connected to your host computer through an RS-232 line (Null Modem cable). 2. Make sure when a TX is matched with an RX when making ADAM-4530 connections. The default setting of ADAM-4530 is Baud rate : 9600, N, 8, 1 Delimiter : { Mode : Addressable Add CR : Yes Address : 01H Protocol : RS-485 So you can use a ADAM-4000 series module for test (for example : ADAM-4011, Address 01H, 9600 bps). Just connect RS-485 port from ADAM-4530 to ADAM-4011. Then you can use command "{01$01M" to verify if RS-485 interface is good or not. It's recommended to use more command for verify. In other words, the behave is the same as ADAM-4521 with addressable mode. Regarding to RS-422 interface, it's recommended to OPEN the GATE of ADAM-4530, then test it with PCL-743/PCL-745 on another computer. Set Data Gate command ======================================= Syntax &AA8(D1D2) (cr) Response !AA (cr) if the command is valid. D1=1 Open data gate D1=0 Close data gate D2=1 Write to EEPROM D2=0 Do not write to EEPROM ======================================= Read Data Gate command ======================================= Syntax &AA9 (cr) Response !AAS (cr) S=0 Gate closed S=1 Gate opened ======================================= After OPEN the GATE, you can transmit and receive any data via ADAM-4530 to PCL-743/PCL-745 of another computer.