Serial Communication
Serial Ports Configuration
VT400 Technical Manual, Rev. A5 43 Doc # UM-VT400-EN
6 Serial Communication
Communication and printer parameters can be set in the SETUP 2 and SETUP 3
submenus of the SETUP menu.
6.1 Serial Ports Configuration
VT400 has two serial ports, designated port 1 and port 2:
Port 1 is an RS232 port.
Port 2 is an optional port installed on order, and can be either RS232 or RS485.
6.1.1 RS232 Serial Port
The port is used to connect to serial printers or personal computers.
General Asynchronous serial ASCII, RS232C standard, full duplex.
Protocol 2400 baud, 1 start, 7 data/even parity or 8 data/no parity, 1 stop bit.
Handshake DTR BUSY per character for fanfold printers or REQUEST PAPER END STATUS for EPSON
TM-295 slip printer.
Connection DB9 male on rear panel (J1 or J3). Three-conductor shielded cable, max distance 15m.
Tx = Pin 3
Rx/DTR = Pin 2
GND = Pin 5
6.1.2 RS485 Serial Port
Used to connect to a host computer, remote printer, remote display, etc.
General Asynchronous serial ASCII, RS485 half duplex.
Protocol 2400 to 57600 baud, 1 start, 7 or 8 data, 1 even parity, 1 stop bit.
Connection DB9 female on rear panel. Two-conductor twisted-pair shielded cable, max distance
1000m. A termination resistor 120R may be connected by shorting pins 8 and 9.
A = Pin 6
B = Pin 7
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