Serial Communication
Serial Ports Configuration
VT300 Technical Manual, Rev. A4
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TM-VT300-EN
6 Serial
Communication
6.1 Serial
Ports
Configuration
VT300 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.
OR
transmit only, 9600 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
Cable gland: stainless steel enclosure or DB9 male on rear panel, aluminum enclosure
(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
Cable gland: stainless steel enclosure or DB9 female on rear panel, aluminum enclosure
(J3). 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
