User Manual
Rocket Port Converter C52/C53
2000137 Rev B
1
Overview
The Comtrol Rocket Port Converters are smart RS-232 to RS-422/485 bi-directional converters. They allow you to convert one RS-232
port to and from either RS-422 or RS-485 ports. You use the converter to control devices with a longer than normal distance between the
host and the device, and to communicate with several devices. Operations like point-to-point and multi-drop are available to meet your
needs.
Rocket Port Converter C53
Features:
• Both the C52 and C53 are RS-232 to RS-422/RS-485 bidirectional converters. The C53 includes isolation protection against high
voltage up to 2000V.
• Comtrol locates the switch settings inside the converter. This protects the system from unintentional changes that would introduce
communication errors without any warning. To make any changes to the operation mode, simply remove the two screws to open the
cover.
• You can power the C52/C53 either from a DC +9V to +30V, 150A power adapter, or the pin 6 and pin 7 on the terminal block.
• LED indicators show the status of transmitting and receiving data, RTS signal, and power.
• Comtrol has added a protect resistor inside the unit to avoid over-current from the remote ground to the converter’s ground.
• Mounting Kit lets you mount the C52/C53 on a wall or any surface.
Overview 2
Specifications
C52/C53 Specification
Current consumption:
Baud rate:
Distance
Note: Baud rate is dependent upon hardware and operating system
configuration.
Optical isolation
C52
C53
Surge protection 25KV ESD for all signals
Dimension 90mm x 60mm x 21mm
Environmental Condition Value
Operating Temperature 0 to 55
Electromagnetic Compliance Status
Emissions:
RFI Emissions: Class A
EN 55022
FCC Part 15: Class A
Immunity:
EN 50082-1
C52 - DC +9V to +30V, 150mA max.
C53 - DC +9V to +30V, 270mA max.
Up to 921.6K bps under 500 feet
(0.15Km)
Up to 4000 feet (1.2 Km) under
115200 bps
No
2000V DC for all signals
o
C
Yes
Yes
Specifications 3
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.
JP1
AUTO
Switch settings tables of Switch 1 and Switch 2 are as follows:
RS-422 mode Off
RS-485 mode On
485
RTS
422
Switch 1
Switch 2
By RTS Off
Auto Data Direction Control (ADDC) On
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.
Installation 4
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