(Last Update: 15-Sep-2015, EDRV FAQ0003)

EDRV FAQ0001 (see also EBC FAQ0015; HA-TADP FAQ0001; ECOM FAQ0008; ERM FAQ0009; WinPLC FAQ0004; EZ Ethernet FAQ0011)
Q: Can the MAC address be changed?
A: The MAC address is burned into the ROM of the device and is set just before it leaves the factory. There is no logical way for any protocol to change this address. Host Engineerings range for Ethernet MAC addresses is 00.E0.62.xx.xx.xx.

However, there was a bug with the old Ether32.EXE program that could change the MAC Address! If you use Ether32.EXE to update the booter using TCP/IP protocol (i.e. use the "/pi" option on the command line), then the MAC Address could be changed by accident!

EDRV FAQ0002 (see also ERM FAQ0010; EBC FAQ0016; ECOM FAQ0009)
Q: Can ERM Workbench be used to upgrade firmware on other Host Ethernet devices (e.g. an ECOM)? And if so, how?
Older versions of ERM Workbench (before v2.0) can be used in this manner. If ERM Workbench is v2.0 or later, then this is not possible; instead NetEdit3 must be used.

If using ERM Workbench earlier than v2.0: 

  1. Open ERM Workbench
  2. Press the <ERM Workbench> button at bottom left (skip using Wizard)
  3. Press the <2. Select Slaves> button at top right. 
  4. Window at left shows ERM devices, but there is a filter at the bottom: "All Devices." Pick this one. 
  5. Now all Host Ethernet devices are shown. Pick device of your choice and press <Upgrade Firmware...> button. Follow instructions.

Q: Can I use Modbus TCP to access the memory in a GS-EDRV?
A: Yes. The Modbus TCP is supported on Port 502. You have access to all of the memory in the GS-EDRV. The parameter type is the upper byte's lower nibble. The particular parameter offsets are in hex. The table below shows how to access any drive parameter.

GS-EDRV Parameter
Modbus TCP (hex) Holding Register (zero-base)
P0.00 0x0000 0
P1.00 0x0100 256
P2.00 0x0200 512
P3.00 0x0300 768
P4.00 0x0400 1024
P5.00 0x0500 1280
P6.00 0x0600 1536
P7.00 0x0700 1792
P8.00 0x0800 2048
P9.00 0x0900 2304


The Run command is at GS Param 9-27 which is mapped into 0x900 (2304) + 27 = 2331. Since Modbus Holding Registers are one-based, then +1 = Holding Register 2332.

There are also other Holding Registers that contain information besides the drives parameter list (above). Below is a table showing some specific drive parameters based on the above table as well as some of the extra ones available:

GS-EDRV Parameter
Description Modbus TCP (hex) Holding Register (one-base)
P9.26 Speed reference 0x091A 2331
P9.27 Run command 0x091B 2332
P9.28 Direction 0x091C 2333
P9.29 External fault 0x091D 2334
P9.30 Fault reset 0x091E 2335
P9.31 Jog 0x091F 2336
--- Status Monitor 1* 0x2100 8449
--- Status Monitor 2*
0x2101 8450
--- Frequency command 0x2102 8451
--- Output frequency 0x2103 8452
--- Output current 0x2104 8453
--- DC bus voltage 0x2105 8454
--- Output voltage 0x2106 8455
--- Motor RPM 0x2107 8456
--- Scale frequency (low) 0x2108 8457
--- Scale frequency (high) 0x2109 8458
--- Percent load 0x210B 8460
--- Firmware version 0x2110 8465
--- Serial comm link health** 0x21FD 8705

* - See manual for details for what this means
** - Value of 1 means the serial comm link is good; 0 means bad

EDRV FAQ0004 (see also NetEdit FAQ0003, ERM FAQ0003, EBC FAQ0006)
Q: NetEdit sees ERM, EBC and EDRV, but ERM Workbench gets error "ERM not found" when trying to write the configuration to the ERM.
A: Downloading the latest version of ERM Workbench may remedy this problem; especially if you are using the ERM Workbench Wizard. You should download at least ERM Workbench v1.1 Build 26. Otherwise here are some things to try:

EDRV FAQ0005 (see also ERM FAQ0014; EBC FAQ0023; ECOM FAQ0019; EZ Ethernet FAQ0014)
Q: For my Ethernet network that would exceed 100 meters, is a standard hub considered a repeater so as to increase the permissible length?
A: Yes. The maximum distance per 10BaseT cable segment is 100 meters. Repeaters (e.g. hubs, bridges, etc.) extend the distance. Each cable segment attached to a repeater can be 100 meters. Thus, two repeaters can gain you a total of 300 meters distance.

Q: Can't get the GS-EDRV to talk to my GS2 drive.
A: The most common mistake made here is not having the drive parameters set properly. Please insure they are set as follows:





P 0.00



Motor Nameplate Voltage Setting

P 0.01



Motor Nameplate Amps Setting




Motor Base frequency




Motor base RPM




Motor Maximum RPM




Coast to stop




Acceleration time




Volts/Hertz set to fans and pumps




RS485 operation control enabled




RS485 speed reference control




RPM display




Communication address (dependent on drive 1-8)




9600 Baud rate




MODBUS RTU 8 data bits, odd parity, 1 stop bit

EDRV FAQ0007 (see also ECOM 0028; EBC FAQ0033, ERM FAQ0020, EZ Ethernet FAQ0017; DirectSOFT FAQ0181; DS Data FAQ0088; SDK FAQ0012; NetEdit FAQ0013)
Q: What Ethernet protocols are used by your products?
A: Refer to chart below:

Product Ethernet Protocols
UDP/IP IPX TCP/IP Raw Ethernet Broadcast (1)
K-seq DirectNet ECOM (2) Koyo Backplane User Defined Data Proprietary (1) K-seq DirectNet ECOM (2) Proprietary (1) Modbus TCP Master Modbus TCP Slave Proprietary (1) Koyo Backplane
Hardware ECOM (3) (4)           (5)
ECOM100 (3) (4)     (6)   (5)
ERM           (7)       (7) (8)      
EDRV                   (12)    
EZ Ethernet                
EZ EtherPLUS              
Software DirectSOFT                
DS Data                
Ethernet SDK (9)       (9)          
NetEdit (10)         (11) (10)     (11)        

(1)  Not an industry standard. However, protocol is available for 3rd-party development upon request.
(2)  Not really a distinct protocol. This setting is used to intelligently pick K-sequence or DirectNet as needed by the hardware/software.
(3)  Used when doing ECOM-to-ECOM via RX/WX instructions with RX/WX Node Map configured in sending ECOM.
(4)  Used when doing ECOM-to-PC (Report-by-Exception) via RX/WX instructions (Address 90 only) with ECOM's dipswitch 7 set ON.
(5)  Used when doing ECOM-to-ECOM via RX/WX instructions without RX/WX Node Map configured in sending ECOM.
(6)  RX/WX Node Map must be configured in ECOM.
(7)  ERM can talk to one slave with UDP/IP and another with IPX simultaneously.
(8)  Planned for Dec2004-Feb2005.
(9)  Requires K-sequence protocol spec (request from Automation Direct)
(10)  Uses K-sequence to perform "Test CPU Access!" function.
(11)  Uses this protocol to perform "Show Base Contents..." function.
(12)  The older HA-EDRV2 cannot talk Modbus TCP.

EDRV FAQ0008 (see also NetEdit FAQ0011; EBC FAQ0004; ECOM FAQ0034; ERM FAQ0024; PBC FAQ0015)
Q: Getting various errors when attempting to update the booter/firmware for my EBCs, ECOMs, EDRVs and ERMs.
A: First make sure you isolate the device from all other tasks (i.e. put the PLC in the STOP mode; stop HMI; isolate from busy network traffic). Secondly, make sure you are using the latest version of NetEdit3 which can be downloaded for free here:

Here are some common problems experienced:

EDRV FAQ0009 (see also CTRIO FAQ0046; EBC FAQ0047; ECOM FAQ0036; ERM FAQ0030; EZ Ethernet FAQ0018; PBC FAQ0009; PSCM FAQ0001; WinPLC FAQ0018; NetEdit FAQ0014)
Q: What software tool do I use to upgrade/downgrade my Host Engineering hardware?
A: Refer to the following:

Host Hardware Part Number Firmware/Booter Upgrade Tool
CTRIO Workbench
T1H-EBC100 NetEdit3 (v3.4 or higher)
H2-EBC100 NetEdit3 (v3.5 or higher)
NetEdit3 (v3.5 or higher)
NetEdit3 or ERM Workbench
EZ Ethernet EZ Ethernet
EZ Touch
PBC H2-PBC NetEdit3
WinPLC WinPLC WinPLC Workbench

NOTE: All the firmware for the above products can be downloaded using NetEdit3's File --> Live Update... The firmware files are stored in c:\HAPTools\Images folder.

EDRV FAQ0010 (see also DS Data FAQ0087; DirectSOFT FAQ0180; NetEdit FAQ0012; EBC FAQ0052; ECOM FAQ0040; ERM FAQ0034; EZ Ethernet FAQ0026)
Q: Getting various errors when attempting to use NetEdit to see or establish a link to a Host Ethernet device.
A: Here are know errors and their suggested solutions:

CAUTION: You may want to consult your Network Administrator before doing any of the solutions below! He/she may not want you to change your PC's setup at all!

EDRV FAQ0011 (see also NetEdit FAQ0004; EBC FAQ0078; ECOM FAQ0025; ERM FAQ0052; EZ Ethernet FAQ0007)
Q: Can retries and timeout values for NetEdit be adjusted to allow it to find Host Ethernet devices on much slower networks?
A: No, but we will probably include this ability in future releases of NetEdit (greater than v3.7). Currently NetEdit sends out a broadcast and waits 600 ms for devices to respond. If the devices take longer than this to respond they will be missing from his list. After the responses are gathered, NetEdit makes a list and then polls each device in the list one at a time to get detailed data, but waits only 250 ms for response from each device. If the device takes longer than this to respond some of its data may be missing. This is not a problem on a normal wired network, but can be a problem on a wireless network or across the Internet where responses can inadvertently be long and inconsistent. Also, since a broadcast is used, any device between NetEdit and the Host Ethernet modules that block broadcasts can prevent NetEdit from seeing anything.

EDRV FAQ0012  (see also DirectSOFT FAQ0183; DS Data FAQ0093; EBC FAQ0057; ECOM FAQ0043; ERM FAQ0037; EZ Ethernet FAQ0027; NetEdit FAQ0017)
Q: How can I install IPX protocol for my NIC?
A:  You can find instructions on how to do this for your particular operating system by going to Start --> Help & Support and searching for "Install NWLink." Below are the instructions from Microsoft for doing this on a WinXP PC. The instructions are similar for other operating systems (e.g. WinNT, Win98, WinME, Win2K).

To install NWLink IPX/SPX/NetBIOS Compatible Transport Protocol
1)  Open Network Connections:
       (a)  Click Start --> Settings --> Control Panel.
       (b)  Double-click Network Connections.
     NOTE:  You must be a member of the Administrators group to install protocols. Also, when IPX is installed it is installed for all your connections. If you don't want it installed for a certain connection, then right-click that connection, click Properties and, on either the General or Networking tab, clear the NWLink IPX/SPX/NetBIOS Compatible Transport Protocol check box.
(2)  Right-click a local area connection, then click Properties.
(3)  On the General tab, click Install.
(4)  In the Select Network Component Type dialog box, click Protocol, and then click Add.
(5)  In the Select Network Protocol dialog box, click NWLink IPX/SPX/NetBIOS Compatible Transport Protocol, and then click OK.

IMPORTANT: The IPX/SPX protocol is not available on WinXP 64-Bit Edition, WinVista or Win7.

EDRV FAQ0013 (see also EBC FAQ0059; ECOM FAQ0051; ERM FAQ0040; EZ Ethernet FAQ0028; NetEdit FAQ0022)
Q: I inadvertently changed the IP address of my Host Engineering Ethernet device and now NetEdit cannot find it, nor can I ping it. How can I get it "back?"
A:  It can be changed using IPX protocol:

  1. If IPX protocol is not installed for your PC's NIC, then install it (see EDRV FAQ0012 above).
  2. Select IPX protocol in NetEdit3 and edit the IP address.

EDRV FAQ0014 (see also ERM FAQ0041; EBC FAQ0060)
Q: In ERM Workbench, what do the colors of the slave numbers in the Slave Status box mean?
A:  Colors indicate slave status of a particular slave:

Grey  Slave not configured.
Green  Slave configured and ERM successfully communicating with it.
Yellow  Slave configured and ERM successfully communicating with it, but the slave has an error in its I/O.
Red  Slave configured but ERM cannot communicate with it.

EDRV FAQ0015 (see also EBC FAQ0061; ECOM FAQ0052; ERM FAQ0042; EZ Ethernet FAQ0029; HA-TADP FAQ0005; WinPLC FAQ0028)
Q: Do any of your Ethernet devices support the next generation of Internet (IPv6)?
A:  No; nor do we have any plans to implement it at this time.

Q: When the GS-EDRV or GS-EDRV100 is connected to the drive, the drive display flashes "cE03" ("Illegal data value") or "Data Invalid" error.
A: First make sure the following 2 drive parameters are set properly:

     P3.00 (Source of Operation Command) =     03 (Operation determined by RS232/RS485 interface. Keypad STOP is enabled), or...
                                                                          04 (Operation determined by RS232/RS485 interface. Keypad STOP is disabled)

     P4.00 (Source of Frequency Command) =    05 (Frequency determined by RS232/RS485 communication interface.

If these are set properly, then this error is probably caused by incompatible versions of GS3 firmware and the GS-EDRV firmware. Solutions:

If you need the older GS-EDRV firmware, please send an e-mail to support@hosteng.com.

EDRV FAQ0017 (see also EBC FAQ0065; ECOM FAQ0053)
Q: Using a 3rd-party Modbus TCP master (e.g. Wonderware), when multiple requests are sent to the ECOM100, EBC100, or EDRV, sometimes some of the packets timeout.
A: The firmware of these devices were originally set up to do one transaction at a time. Multiple requests to different TCP port numbers was not a problem. This problem was fixed in:

H0-ECOM100 firmware version 4.0.52 (or later)
H2-ECOM100 firmware version 4.0.999 (or later)
H2-EBC100 firmware version 4.0.464 (or later)
T1H-EBC100 firmware version 4.0.1309 (or later)
GS-EDRV firmware version 1.1.267 (or later)

EDRV FAQ0018 (see also EBC FAQ0069; ECOM FAQ0055; ERM FAQ0044; EZ Ethernet FAQ0030; HA-TADP FAQ0006; WinPLC FAQ0032)
Q: What types of Ethernet framing do your Ethernet products support?
A: All our Ethernet products (ECOM, ECOM100, EBC, EBC100, EDRV, ERM, EZ Ethernet, EZ EtherPLUS, HA-TADP and WinPLC) all support the following types of Ethernet framing:

EDRV FAQ0019 (see also EBC FAQ0070; ECOM FAQ0061; ERM FAQ0045; EZ Ethernet FAQ0031; HA-TADP FAQ0007; WinPLC FAQ0033)
Q: Are the Host Engineering Ethernet products compliant to AS ISO 15745?
A: No.

EDRV FAQ0020 (see also ERM FAQ0053)
Q: Why aren't all the drive parameters mapped in the EDRV when used with ERM?
A: When using the EDRV with an ERM, we had to chose to map only the most frequently used ones in order to save on network and scan time simply because there are an abundance of drive parameters.

There are 2 possible ways to access non-mapped parameters in the drive:

EDRV FAQ0021 (see also ECOM FAQ0067)
Q: Can't get my ECOM100 as a Modbus TCP Client (master) to communicate properly to my GS-EDRV.
A: This is a bug in the ECOM100 firmware. Firmware that fixes this problem is:

H0-ECOM100 v4.0.52 (or later)
H2-ECOM100 v4.0.914 (or later)

EDRV FAQ0022 (see also ERM FAQ0049)
Q: When using the HA-EDRV with an H2-ERM or H4-ERM, sometimes one or more of the Output Words seems to stop updating and working correctly.
A: This is a bug in the HA-EDRV firmware v1.0.121 and earlier. The problem is fixed in:

HA-EDRV firmware v1.0.128 and later

EDRV FAQ0023  (see also NetEdit FAQ0032; EBC FAQ0076; ECOM FAQ0092; ERM FAQ0050)
Q: Can firmware upgrades be performed over a remote network (e.g. over the Internet)?
A: Not normally, no. The reason is because NetEdit must be able to see the Host Ethernet device in his list. The list is compiled by NetEdit sending out a broadcast and having all the Host Ethernet devices respond. Since the Internet will block all broadcasting, then the list will always be blank. However, it is possible to configure a VPN (Virtual Private Network) between the locations and configure the VPN in such a way as to allow broadcasting.

EDRV FAQ0024 (see also ERM FAQ0054)
Q: Input Word 3 (IW3) of my EDRV (mapped through an ERM) does not indicate External Fault (EF).
A: This is usually because there is a misunderstanding of what is meant by "External Fault" with regards to drive parameter P9.29. An External Fault (EF) can be manually triggered in 2 ways:

          1.  Drive digital input:  By default, shorting the DCM terminal to DI3 causes an EF which can be reset using the Reset button on the drive keypad. An EF triggered in this manner is not indicated in drive parameter P9.29.
          2.  Serial communication partner:  A serial communication device can write a 1 to P9.29 to manually trigger an EF in the drive, or write a 1 to P9.30 to reset the EF.

Now, to construct IW3, the EDRV merely reads drive parameter P9.29 (External Fault [triggered by serial communication device]) and then ORs that value with its own Serial Communications Fault Bit. Thus:


Thus, possible values for IW3 are be:

IW3 (value in decimal)

  EDRV Serial Comm Fault?

External Fault?
(manually triggered by serial communication partner)













EDRV FAQ0025 (see also ERM FAQ0055)
Q: Input Word 4 (IW4) of my EDRV (mapped through an ERM) does not clear to zero (0) when the drive fault is cleared.
A: This is because IW4 is not actually the "Status Monitor" (i.e. 2100 hex, or Modbus Address 8448). Instead, IW4 is merely reading P6.31 (Present Fault Record).

If you wish to monitor for an error on the drive, it is best to use the ERM Slave Status Bits (mapped to X300 - X317 by default).

EDRV FAQ0026 (see also ERM FAQ0056; EBC FAQ0081)
Q: Trying to use the example in B-2 of the ERM Manual to reset errors in the EDRV and EBC/EBC100, but X330 (ERM Disable Request Bit) of the ERM Status Word never comes ON.
A:  This is a bug in older versions of the ERM firmware.

The ERM Status Word contains the current ERM Error Code in the LSByte and the Status Bits in the MSByte. Currently, only bit 8 (X330) is used in the MSB designating the ERM is disabling a Slave. Earlier versions of the ERM firmware was incorrectly handling this feedback bit. This is fixed in the following firmware:

H2-ERM    v1.1.19 (or later)
H4-ERM    v1.1.19 (or later)

EDRV FAQ0027 (see also CTRIO FAQ0045; DirectSOFT FAQ0132; DL Plus FAQ0010; DNLoader FAQ0011; DS Data FAQ0102; EBC FAQ0083; ECOM FAQ0084; ERM FAQ0058; EZ Ethernet FAQ0010; General FAQ0004; HA-TADP FAQ0008; Lookout Direct FAQ0015; NetEdit FAQ0037; PBC FAQ0014; PSCM FAQ0003; SDK FAQ0022; SERIO FAQ0004; WinPLC FAQ0038)
Q: What is the export classification of your products (e.g. ECCN)
A: None of our products have an ECCN. Automation Direct sells our products and they export EAR99 NLR (No License Required). ECCN is Export Controlled Classification Number and none of our products are controlled.

EDRV FAQ0028 (see also ECOM FAQ0099; EBC FAQ0085; EZ Ethernet FAQ0013)
Q: Do Host Ethernet devices use full- or half-duplex communications?
A: Half-duplex, allowing alternating transmission in 2 directions, but not in both directions simultaneously.

EDRV FAQ0029 (see also ECOM FAQ0114, EBC FAQ0086, ERM FAQ0060, EZEthernet FAQ0032, NetEdit FAQ0040)
Q: What do the Ethernet Stats at the bottom of NetEdit specifically mean?
A:  These are stats that are reported up to the firmware from the hardware communication components. They are technically defined as:

Missed Fr - "Missed Frames" - A count of the packets missed due to overruns, unavailable buffers or a disabled receiver.
TX Coll
"Transmit Collisions" - A count of the packets which had a late collision while being received.
Lost Pkts
- "Lost Packets" - A count of the packets discarded because they were too long or too short.
Bad Pkts
- "Bad Packets" - A count of the packets which have bad CRCs (checksums).
- A count of the packets which contain invalid symbols, extra bits or resulted in a receiver overrun condition.
TX Errors
- "Transmit Errors" - A count of the packets which could not be sent because the transmitter was unavailable for an extended period of time.

EDRV FAQ0030 (similar to EBC FAQ0087, ECOM FAQ0115, MB-GATEWAY FAQ0001)
Q: How many Modbus TCP masters/clients can the EDRV100 support?
A:  Twelve (12) simultaneous TCP connections are maintained. If a 13th master/client attempts to communicate, then the EDRV100 will reset (RST) the oldest TCP connection (i.e. close one master/client's TCP connection).

EDRV FAQ0031 (see also EBC FAQ0091; ECOM FAQ0085; NetEdit FAQ0028)
Q: My ECOM100/EDRV100/EBC100 disappears from NetEdit using TCP/IP protocol if I accidentally give it a bogus IP address, or gateway address, or subnet mask.
A: This has not been a serious problem until the advent of WinVista. The reason being that you normally could switch to IPX in NetEdit and find the Ethernet device and then fix the mistake. However, with the advent of WinVista, IPX is no longer available. Thus, the following changes were made to the ECOM100, EDRV100 & EBC100 firmware and NetEdit to alleviate this issue:

These fixes are in:

H2-EBC100 v4.0.490 (or later)
T1H-EBC100 v4.0.1322 (or later)
H0-ECOM100 v4.0.167 (or later)
H2-ECOM100 v4.0.1237 (or later)
H4-ECOM100 v4.0.1237 (or later)
GS-EDRV100 v5.0.218 (or later)
NetEdit v3.7

EDRV FAQ0032 (see also ECOM FAQ0118, EBC FAQ0092, ERM FAQ0065)
What does a flashing/blinking Err light indicate?
A:  This is an indication of a fatal error. The blink codes specifically mean: