During power up of my E2050A the front panel LEDs briefly turn on in a few different patterns. After less than 10 seconds with nothing connected to the HP-IB / GPIB and LAN connectors the only LED that remains on is the Power LED.
If the SRQ LED remains on with your E2050A with nothing connected to the HP-IB / GPIB connector and you cannot get any response on the serial port with a null modem cable connection at 19200 baud, 8 bit, no parity, then maybe your E2050A has a hardware fault. If you just acquired it off of eBay, it might not be too surprising if it turns out to be dead.
Serial port output at 19200,N,8,1 after sending a CR to the E2050A after power up:
Welcome to the E2050A LAN/HP-IB Gateway configuration utility.
Commands
? Show additional commands
exit, quit Exit WITHOUT saving configuration changes
reboot Save configuration changes and restart
status Show the LAN/HP-IB Gateway connection status
Configuration Parameters
hostname: E2050 # Internet domain name
hardware-addr: 0800091AEE6E # Ethernet station address
ip: 192.168.1.20 # Internet Protocol address
default-gw: 192.168.1.1 # Default subnet gateway IP address
subnet-mask: 255.255.255.0 # Network subnet mask
syslog-svr: 0.0.0.0 # Syslog server IP address
bootp: OFF # Obtain config via BOOTP/TFTP
lan-timeout: 0 # LAN connect timeout in seconds
io-timeout: 120 # Server I/O timeout in seconds
allow: * # IP allow list
hpib-address: 21 # HP-IB System Controller Address
hpib-name: gpib0 # HP-IB interface symbolic name
hpib-unit: 7 # HP-IB logical unit number
> ?
Available commands are:
allow: <ip> [<ip>] Set the allow list for IP security
bootp: <ON|OFF> Turn ON or OFF use of BOOTP/TFTP
bye Quit without saving configuration - see reboot
config Show current settings
default-gw: <ip address> Set the default subnet gateway address
exit Exit without saving configuration - see reboot
factory-reset Reset configuration to factory defaults and reboot
hardware-addr Display the ethernet station address
help Print help information
hostname: <string*35> Set the internet domain name
hpib-address: <0-30> Set the HP-IB system controller address
hpib-name: <string*15> Set the HP-IB interface symbolic name
hpib-unit: <1-255> Set the HP-IB logical unit number
io-timeout: <seconds> Set the server I/O timeout in seconds. 0 is Off.
ip: <ip address> Set the IP address
lan-timeout: <seconds> Set the LAN connect timeout in seconds. 0 is Off.
quit Quit without saving configuration - see reboot
reboot Save configuration and restart
status Show the LAN/HP-IB Gateway connection status
subnet-mask: <mask> Set the network subnet mask
syslog-clear Clear the syslog
syslog-display Display the syslog contents
syslog-svr: <ip address> Set the syslog server address
version Show the firmware revision
> version
Software revision A.01.03
Bootrom revision A.01.00