Comtrol C53 User Manual
Page 4
Installation
4
Package Check List
C52 (C53) RS-232 to RS-422/RS-485 bidirectional converter
Power adapter
Cable
Mounting kit
User manual
Installation
1.
The RS-232 and RS-422-485 ports are labeled clearly on the surface of the C52 and C53 converters. Prepare the RS-232 cable and
decide the operation mode as well as the 2/4-wire cable in advance. See the RS-232 Cable Wiring and Operations sections.
If you need to change the operation mode, remove the two screws on top of the converter and open the cover. Change the switches to
reflect your desired mode.
The DIP switches set the operation mode (RS-422 or RS-485) and the control mode (by RTS or ADDC) for RS-485 mode.
Switch settings tables of Switch 1 and Switch 2 are as follows:
2.
When you are using the RS-485 in a multi-drop mode, Comtrol includes one jumper per unit to enable the termination resistor. You
only enable the jumper (JP1) at the extreme ends of the chain.
In the RS-422 mode, the RxD always enables a 120 Ohm terminating resistor.
LED Indicators
There are LED indicators for TxD, RxD, RTS, and PWR on top of the unit. The indicators are not on when the unit is not connected with
a signal or power.
•
The TxD indicator stands for transmitted data from RS-232 to RS-422 or RS-485. It illuminates when connected and data is
transmitting.
•
The RxD indicator stands for received data from RS-422 or RS-485 to RS-232. It illuminates when connected and receiving data.
•
The RTS indicator is for the RS-232 RTS signal (Request To Send). It illuminates when it is connected and the RTS signal is on.
•
The PWR indicator illuminates when the power is on and not lit when the power is off or not connected.
Switch 1
RS-422 mode
Off
RS-485 mode
On
Switch 2
By RTS
Off
Auto Data Direction Control (ADDC)
On
AUTO
485
RTS
422
JP1