Datasheet
E5EC/E5AC
42
USB-Serial Conversion Cable
Windows is a registered trademark of Microsoft Corporation in the 
United States and or other countries.
* Use a high-power port for the USB port.
Note: A driver must be installed on the computer. Refer to the 
Instruction Manual included with the Cable for the installation 
procedure.
Communications Specifications
* The baud rate, data bit length, stop bit length, and vertical parity can be in-
dividually set using the Communications Setting Level.
Communications Functions
MELSEC is a registered trademark of Mitsubishi Electric Corporation. 
KEYENCE is a registered trademark of Keyence Corporation.
*1 A Temperature Controller with version 1.1 or higher is required.
A Temperature Controller with version 2.1 or higher is required for 
the FX Series or the KV Series.
*2 Both the programless communications and the component 
communications support the copying.
Current Transformer (Order Separately) 
Ratings
Heater Burnout Alarms and SSR Failure 
Alarms
*1. For heater burnout alarms, the heater current will be measured when the
control output is ON, and the output will turn ON if the heater current is
lower than the set value (i.e., heater burnout detection current value).
*2. For SSR failure alarms, the heater current will be measured when the
control output is OFF, and the output will turn ON if the heater current is
higher than the set value (i.e., SSR failure detection current value).
*3. The value is 30 ms for a control period of 0.1 s or 0.2 s.
*4. The value is 35 ms for a control period of 0.1 s or 0.2 s.
Electrical Life Expectancy Curve for 
Relays (Reference Values) 
Applicable OS Windows XP, Vista, or 7
Applicable software CX-Thermo version 4.5 or higher
Applicable models E5@C-T Series, E5@C Series, and E5CB Series
USB interface standard Conforms to USB Specification 2.0.
DTE speed 38,400 bps
Connector 
specifications
Computer: USB (type A plug)
Digital Temperature Controller: 
Special serial connector
Power supply Bus power (Supplied from USB host controller.)
*
Power supply voltage 5 VDC
Current consumption 450 mA max.
Output voltage
4.7±0.2 VDC 
(Supplied from USB-Serial Conversion Cable to 
the Digital Temperature Controller.)
Output current
250 mA max. 
(Supplied from USB-Serial Conversion Cable to 
the Digital Temperature Controller.)
Ambient operating 
temperature
0 to 55°C (with no condensation or icing)
Ambient operating 
humidity
10% to 80%
Storage temperature -20 to 60°C (with no condensation or icing)
Storage humidity 10% to 80%
Altitude 2,000 m max.
Weight
Approx. 120 g
Transmission line 
connection method
RS-485: Multidrop
Communications RS-485 (two-wire, half duplex)
Synchronization 
method
Start-stop synchronization
Protocol CompoWay/F, or Modbus
Baud rate* 9600, 19200, 38400, or 57600 bps
Transmission
code
ASCII
Data bit length* 7 or 8 bits
Stop bit length* 1 or 2 bits
Error detection
Vertical parity (none, even, odd)
Block check character (BCC) with
CompoWay/F or CRC-16 Modbus
Flow control None
Interface RS-485
Retry function None
Communications buffer 217 bytes
Communications 
response wait time
0 to 99 ms
Default: 20 ms
Programless 
communications
*1
You can use the memory in the PLC to read and 
write E5@C parameters, start and stop operation, 
etc. The E5@C automatically performs communi-
cations with PLCs. No communications program-
ming is required.
Number of connected Digital Temperature Con-
trollers: 32 max. (Up to 16 for the FX Series)
Applicable PLCs
OMRON PLCs
CS Series, CJ Series, or CP Series
Mitsubishi Electric PLCs
MELSEC Q Series, L Series, or FX Series 
(compatible with the FX2 or FX3 (excluding 
the FX1S))
KEYENCE PLCs
KEYENCE KV Series
Component 
Communications
*1
When Digital Temperature Controllers are con-
nected, set points and RUN/STOP commands 
can be sent from the Digital Temperature Control-
ler that is set as the master to the Digital Temper-
ature Controllers that are set as slaves.
Slope and offsets can be set for the set point.
Number of connected Digital Temperature Con-
trollers: 32 max. (including master)
Copying
*2
When Digital Temperature Controllers are con-
nected, the parameters can be copied from the 
Digital Temperature Controller that is set as the 
master to the Digital Temperature Controllers that 
are set as slaves.
Dielectric strength 1,000 VAC for 1 min
Vibration resistance 50 Hz, 98 m/s
2
Weight
E54-CT1: Approx. 11.5 g, 
E54-CT3: Approx. 50 g
Accessories
(E54-CT3 only)
Armatures (2)
Plugs (2)
CT input (for heater 
current detection)
Models with detection for singlephase 
heaters: One input
Models with detection for singlephase or 
three-phase heaters: Two inputs
Maximum heater 
current
50 A AC
Input current indica-
tion accuracy
±5% FS ±1 digit max.
Heater burnout 
alarm setting range 
*1
0.1 to 49.9 A (in units of 0.1 A)
Minimum detection ON time: 100 ms *3
SSR failure alarm 
setting range *2
0.1 to 49.9 A (in units of 0.1 A)
Minimum detection OFF time: 100 ms *4
500
300
100
50
30
10
5
3
1
01 2 3 4 56
Switching current (A)
E5EC/E5AC
250 VAC, 30 VDC
(resistive load)
cosφ = 1
Life (× 10
4
 operations)










